diff --git a/client/web/compose/src/components/ModuleFields/Editor/Number.vue b/client/web/compose/src/components/ModuleFields/Editor/Number.vue
index c4f9d4c58..784fbd3fc 100644
--- a/client/web/compose/src/components/ModuleFields/Editor/Number.vue
+++ b/client/web/compose/src/components/ModuleFields/Editor/Number.vue
@@ -52,19 +52,20 @@
       </b-input-group>
     </multi>
 
-    <b-input-group
-      v-else
-      :prepend="field.options.prefix"
-      :append="field.options.suffix"
-    >
-      <b-form-input
-        v-model="value"
-        autocomplete="off"
-        type="number"
-        number
-      />
-    </b-input-group>
-    <errors :errors="errors" />
+    <template v-else>
+      <b-input-group
+        :prepend="field.options.prefix"
+        :append="field.options.suffix"
+      >
+        <b-form-input
+          v-model="value"
+          autocomplete="off"
+          type="number"
+          number
+        />
+      </b-input-group>
+      <errors :errors="errors" />
+    </template>
   </b-form-group>
 </template>
 <script>
diff --git a/client/web/compose/src/components/ModuleFields/Editor/Select.vue b/client/web/compose/src/components/ModuleFields/Editor/Select.vue
index 84e020993..b873fc6da 100644
--- a/client/web/compose/src/components/ModuleFields/Editor/Select.vue
+++ b/client/web/compose/src/components/ModuleFields/Editor/Select.vue
@@ -39,6 +39,8 @@
           :options="selectOptions"
           stacked
         />
+
+        <errors :errors="errors" />
       </template>
 
       <multi
diff --git a/client/web/compose/src/components/ModuleFields/errors.vue b/client/web/compose/src/components/ModuleFields/errors.vue
index e84807278..aa46fbb3c 100644
--- a/client/web/compose/src/components/ModuleFields/errors.vue
+++ b/client/web/compose/src/components/ModuleFields/errors.vue
@@ -9,7 +9,7 @@
       <span
         :class="{ 'text-primary': error.kind.includes('warning') }"
       >
-        {{ $t(error.message, { value: error.meta.value }) }}
+        {{ error.message }}
       </span>
     </b-form-invalid-feedback>
   </div>
diff --git a/lib/js/src/compose/types/page-block/record-list.ts b/lib/js/src/compose/types/page-block/record-list.ts
index 57e8ce7fa..2323c32e9 100644
--- a/lib/js/src/compose/types/page-block/record-list.ts
+++ b/lib/js/src/compose/types/page-block/record-list.ts
@@ -50,19 +50,21 @@ interface Options {
   positionField?: string;
   refField?: string; // When adding a new record, prefill refField value with parent record ID
   editFields?: unknown[];
-  linkToParent: boolean; // Legacy
-
+  
+  // When adding a new record, link it to parent when available
+  linkToParent: boolean;
+  
   // Should records be opened in a new tab
   // legacy field that has been removed but we keep it for backwards compatibility
   openInNewTab: boolean;
-
+  
   // Are table rows selectable
   selectable: boolean;
   selectMode: 'multi' | 'single' | 'range';
-
+  
   // Ordered list of buttons to display in the block
   selectionButtons: Array<Button>;
-
+  
   bulkRecordEditEnabled: boolean;
   inlineRecordEditEnabled: boolean;
   filterPresets: FilterPreset[];
diff --git a/locale/en/corteza-server/compose/record-field.yaml b/locale/en/corteza-server/compose/record-field.yaml
index 5f5f4c924..40c0af9f3 100644
--- a/locale/en/corteza-server/compose/record-field.yaml
+++ b/locale/en/corteza-server/compose/record-field.yaml
@@ -2,5 +2,4 @@ errors:
   empty: This field is required
   invalidValue: Invalid field value
   invalidRef: Invalid field reference
-  duplicateValueInSet: This value already exists in list
-  duplicateValue: The value "{{value}}" already exists in another record
+  duplicateValueInSet: This value already exists in list
\ No newline at end of file
diff --git a/server/compose/types/record.go b/server/compose/types/record.go
index 93b31e48b..104388e66 100644
--- a/server/compose/types/record.go
+++ b/server/compose/types/record.go
@@ -359,7 +359,7 @@ func (set RecordBulkSet) ToBulkOperations(dftModule uint64, dftNamespace uint64)
 }
 
 // GetValuesByName filters values for records by names
-func (set RecordSet) GetValuesByName(names ...string) (out RecordValueSet) {
+func (set RecordSet) GetValuesByName(names ...string) (out map[uint64]RecordValueSet) {
 	nameMap := make(map[string]bool)
 	for _, n := range names {
 		if len(n) > 0 {
@@ -367,11 +367,13 @@ func (set RecordSet) GetValuesByName(names ...string) (out RecordValueSet) {
 		}
 	}
 
+	out = make(map[uint64]RecordValueSet)
 	err := set.Walk(func(rec *Record) error {
 		_ = rec.Values.Walk(func(val *RecordValue) error {
 			if val != nil && nameMap[val.Name] {
 				val.RecordID = rec.ID
-				out = append(out, val)
+
+				out[val.RecordID] = append(out[val.RecordID], val)
 			}
 			return nil
 		})
diff --git a/server/compose/types/record_detect_duplicates.go b/server/compose/types/record_detect_duplicates.go
index acd595d02..3be08e440 100644
--- a/server/compose/types/record_detect_duplicates.go
+++ b/server/compose/types/record_detect_duplicates.go
@@ -1,265 +1,337 @@
 package types
 
 import (
-	"context"
-	"fmt"
-	"strings"
+    "context"
+    "fmt"
+    "strings"
 
-	"github.com/cortezaproject/corteza/server/pkg/locale"
-	"github.com/cortezaproject/corteza/server/pkg/str"
-	"github.com/spf13/cast"
+    "github.com/cortezaproject/corteza/server/pkg/locale"
+    "github.com/cortezaproject/corteza/server/pkg/str"
+    "github.com/spf13/cast"
 )
 
 type (
-	deDup struct {
-		ls localeService
-	}
+    deDup struct {
+        ls localeService
+    }
 
-	localeService interface {
-		T(ctx context.Context, ns, key string, rr ...string) string
-	}
+    localeService interface {
+        T(ctx context.Context, ns, key string, rr ...string) string
+    }
 
-	DeDupRule struct {
-		Name          DeDupRuleName          `json:"name"`
-		Strict        bool                   `json:"strict"`
-		ErrorMessage  string                 `json:"errorMessage"`
-		ConstraintSet DeDupRuleConstraintSet `json:"constraints"`
-	}
+    DeDupRule struct {
+        Name          DeDupRuleName          `json:"name"`
+        Strict        bool                   `json:"strict"`
+        ErrorMessage  string                 `json:"errorMessage"`
+        ConstraintSet DeDupRuleConstraintSet `json:"constraints"`
+    }
 
-	DeDupRuleConstraint struct {
-		Attribute  string                    `json:"attribute"`
-		Modifier   DeDupValueModifier        `json:"modifier"`
-		MultiValue DeDupMultiValueConstraint `json:"multiValue"`
-	}
+    DeDupRuleConstraint struct {
+        Attribute  string                    `json:"attribute"`
+        Modifier   DeDupValueModifier        `json:"modifier"`
+        MultiValue DeDupMultiValueConstraint `json:"multiValue"`
+    }
 
-	DeDupRuleConstraintSet []*DeDupRuleConstraint
+    DeDupRuleConstraintSet []*DeDupRuleConstraint
 
-	// DeDupRuleName represent the identifier for duplicate detection rule
-	DeDupRuleName string
+    // DeDupRuleName represent the identifier for duplicate detection rule
+    DeDupRuleName string
 
-	// DeDupValueModifier represent the algorithm used to check value string
-	DeDupValueModifier string
+    // DeDupValueModifier represent the algorithm used to check value string
+    DeDupValueModifier string
 
-	// DeDupMultiValueConstraint for matching multi values accordingly
-	DeDupMultiValueConstraint string
+    // DeDupMultiValueConstraint for matching multi values accordingly
+    DeDupMultiValueConstraint string
 
-	// DeDupIssueKind based on strict mode rule or duplication config
-	DeDupIssueKind string
+    // DeDupIssueKind based on strict mode rule or duplication config
+    DeDupIssueKind string
 )
 
 const (
-	ignoreCase    DeDupValueModifier = "ignore-case"
-	caseSensitive DeDupValueModifier = "case-sensitive"
-	fuzzyMatch    DeDupValueModifier = "fuzzy-match"
-	soundsLike    DeDupValueModifier = "sounds-like"
+    ignoreCase    DeDupValueModifier = "ignore-case"
+    caseSensitive DeDupValueModifier = "case-sensitive"
+    fuzzyMatch    DeDupValueModifier = "fuzzy-match"
+    soundsLike    DeDupValueModifier = "sounds-like"
 
-	oneOf DeDupMultiValueConstraint = "one-of"
-	equal DeDupMultiValueConstraint = "equal"
+    oneOf DeDupMultiValueConstraint = "one-of"
+    equal DeDupMultiValueConstraint = "equal"
 
-	deDupWarning DeDupIssueKind = "duplication_warning"
-	deDupError   DeDupIssueKind = "duplication_error"
+    deDupWarning DeDupIssueKind = "duplication_warning"
+    deDupError   DeDupIssueKind = "duplication_error"
 )
 
 func DeDup() *deDup {
-	return &deDup{
-		ls: locale.Global(),
-	}
+    return &deDup{
+        ls: locale.Global(),
+    }
 }
 
 func (d deDup) CheckDuplication(ctx context.Context, rules DeDupRuleSet, rec Record, rr RecordSet) (out *RecordValueErrorSet, err error) {
-	out = &RecordValueErrorSet{}
-	err = rules.Walk(func(rule *DeDupRule) error {
-		if rule.HasAttributes() {
-			values := rr.GetValuesByName(distinct(rule.Attributes())...)
+    out = &RecordValueErrorSet{}
+    err = rules.Walk(func(rule *DeDupRule) error {
+        if rule.HasAttributes() {
+            values := rr.GetValuesByName(distinct(rule.Attributes())...)
 
-			set := rule.validateValue(ctx, d.ls, rec, values)
+            for valID, value := range values {
+                if valID == rec.ID {
+                    continue
+                }
 
-			if !set.IsValid() {
-				out.Push(set.Set...)
-			}
-		}
-		return nil
-	})
-	if err != nil {
-		return
-	}
+                set := rule.validateValue(ctx, d.ls, rec, value)
 
-	if out.IsValid() {
-		out = nil
-	}
-	return
+                if !set.IsValid() {
+                    out.Push(set.Set...)
+                }
+            }
+        }
+        return nil
+    })
+    if err != nil {
+        return
+    }
+
+    if out.IsValid() {
+        out = nil
+    }
+    return
 }
 
 func (rule DeDupIssueKind) String() string {
-	return string(rule)
+    return string(rule)
 }
 
 func (rule DeDupRule) HasAttributes() bool {
-	return len(rule.ConstraintSet) > 0 && len(rule.Attributes()) > 0
+    return len(rule.ConstraintSet) > 0 && len(rule.Attributes()) > 0
 }
 
 func (rule DeDupRule) Attributes() (out []string) {
-	for _, c := range rule.ConstraintSet {
-		out = append(out, c.Attribute)
-	}
-	return
+    for _, c := range rule.ConstraintSet {
+        out = append(out, c.Attribute)
+    }
+    return
 }
 
 func (rule DeDupRule) IsStrict() bool {
-	return rule.Strict
+    return rule.Strict
 }
 
 func (rule DeDupRule) IssueKind() string {
-	out := deDupWarning
-	if rule.Strict {
-		out = deDupError
-	}
+    out := deDupWarning
+    if rule.Strict {
+        out = deDupError
+    }
 
-	return out.String()
+    return out.String()
 }
 
-func (rule DeDupRule) IssueMessage() (out string) {
-	return "record-field.errors.duplicateValue"
+func (rule DeDupRule) IssueMessage(value string) (out string) {
+    return fmt.Sprintf("The value %s already exists in another record", value)
+}
+
+func (rule DeDupRule) IssueMultivalueMessage(values []string) (out string) {
+    return fmt.Sprintf("The values [%s] already exist in another record", strings.Join(values, ", "))
 }
 
 func (rule DeDupRule) String() string {
-	return fmt.Sprintf("%s duplicate detection on `%s` field", rule.Name, strings.Join(rule.Attributes(), ", "))
+    return fmt.Sprintf("%s duplicate detection on `%s` field", rule.Name, strings.Join(rule.Attributes(), ", "))
 }
 
 // validateValue will check duplicate detection based on rules name
 func (rule DeDupRule) validateValue(ctx context.Context, ls localeService, rec Record, vv RecordValueSet) (out *RecordValueErrorSet) {
-	return rule.checkCaseSensitiveDuplication(ctx, ls, rec, vv)
+    return rule.checkDuplication(ctx, ls, rec, vv)
 }
 
-func (rule DeDupRule) checkCaseSensitiveDuplication(ctx context.Context, ls localeService, rec Record, vv RecordValueSet) (out *RecordValueErrorSet) {
-	var (
-		recVal = rec.Values
-	)
+func (rule DeDupRule) checkDuplication(ctx context.Context, ls localeService, rec Record, vv RecordValueSet) (out *RecordValueErrorSet) {
+    var (
+        recVal = rec.Values
+    )
 
-	for _, c := range rule.ConstraintSet {
-		rvv := recVal.FilterByName(c.Attribute)
-		if rvv.Len() == 0 {
-			continue
-		}
+    for _, c := range rule.ConstraintSet {
+        rvv := recVal.FilterByName(c.Attribute)
+        if rvv.Len() == 0 {
+            continue
+        }
 
-		var (
-			valErr = &RecordValueErrorSet{}
-		)
+        var (
+            valErr = &RecordValueErrorSet{}
+        )
 
-		_ = vv.Walk(func(v *RecordValue) error {
-			if v.RecordID != rec.ID {
-				_ = rvv.Walk(func(rv *RecordValue) error {
-					if len(rv.Value) > 0 && matchValue(c.Modifier, rv.Value, v.Value) {
-						valErr.Push(RecordValueError{
-							Kind:    rule.IssueKind(),
-							Message: ls.T(ctx, "compose", rule.IssueMessage()),
-							Meta: map[string]interface{}{
-								"field":         v.Name,
-								"value":         v.Value,
-								"dupValueField": rv.Name,
-								"recordID":      cast.ToString(v.RecordID),
-								"rule":          rule.String(),
-							},
-						})
-					}
-					return nil
-				})
+        existingVv := vv.FilterByName(c.Attribute)
+        moduleField := rec.module.Fields.FindByName(c.Attribute)
 
-				// 1. multiValue is empty, then all value needs to be a match then return error/warning
-				// 2. multiValue is oneOf, then one or more value needs to be a match then return error/warning
-				// 3. multiValue is equal, then all value needs to be a match then return error/warning
-				if (!valErr.IsValid() && (!c.HasMultiValue() || c.IsAllEqual()) && valErr.Len() == rvv.Len()) || (c.IsOneOf() && valErr.Len() > 0) {
-					if out == nil {
-						out = &RecordValueErrorSet{}
-					}
-					out.Push(valErr.Set...)
-				}
-			}
-			return nil
-		})
-	}
+        if moduleField.Multi && c.IsAllEqual() {
+            return rule.multiValueAllEqual(ctx, ls, c, rvv, existingVv)
+        }
 
-	return
+        _ = vv.Walk(func(v *RecordValue) error {
+            if v.RecordID != rec.ID {
+                _ = rvv.Walk(func(rv *RecordValue) error {
+                    if len(rv.Value) > 0 && matchValue(c.Modifier, rv.Value, v.Value) {
+                        valErr.Push(RecordValueError{
+                            Kind:    rule.IssueKind(),
+                            Message: ls.T(ctx, "compose", rule.IssueMessage(v.Value)),
+                            Meta: map[string]interface{}{
+                                "field":         v.Name,
+                                "value":         v.Value,
+                                "dupValueField": rv.Name,
+                                "recordID":      cast.ToString(v.RecordID),
+                                "rule":          rule.String(),
+                            },
+                        })
+                    }
+                    return nil
+                })
+
+                // 1. multiValue is empty, then all value needs to be a match then return error/warning
+                // 2. multiValue is oneOf, then one or more value needs to be a match then return error/warning
+                // 3. multiValue is equal, then all value needs to be a match then return error/warning
+                if (!valErr.IsValid() && (!c.HasMultiValue() || c.IsAllEqual()) && valErr.Len() == rvv.Len()) || (c.IsOneOf() && valErr.Len() > 0) {
+                    if out == nil {
+                        out = &RecordValueErrorSet{}
+                    }
+                    out.Push(valErr.Set...)
+                }
+            }
+            return nil
+        })
+    }
+
+    return
+}
+
+func (rule DeDupRule) multiValueAllEqual(ctx context.Context, ls localeService, c *DeDupRuleConstraint, rvv RecordValueSet, existingVv RecordValueSet) (out *RecordValueErrorSet) {
+    var (
+        valErr = &RecordValueErrorSet{}
+    )
+
+    if rvv.Len() == existingVv.Len() {
+        rvvmap := make(map[string]int)
+        existingVvmap := make(map[string]int)
+
+        dupValues := recordValueFrequencyMap(rvvmap, c.Modifier, rvv)
+        _ = recordValueFrequencyMap(existingVvmap, c.Modifier, existingVv)
+
+        if matchRecordValueFrequencyMap(rvvmap, existingVvmap) {
+            valErr.Push(RecordValueError{
+                Kind:    rule.IssueKind(),
+                Message: ls.T(ctx, "compose", rule.IssueMultivalueMessage(dupValues)),
+                Meta: map[string]interface{}{
+                    "field":         c.Attribute,
+                    "dupValueField": c.Attribute,
+                    "rule":          rule.String(),
+                },
+            })
+
+            return valErr
+        }
+    }
+
+    return nil
 }
 
 func (dr DeDupRuleSet) Validate() (err error) {
-	return dr.Walk(func(rule *DeDupRule) (err error) {
-		if !rule.HasAttributes() {
-			err = fmt.Errorf("deduplication not valid (no constraints)")
-			return
-		}
+    return dr.Walk(func(rule *DeDupRule) (err error) {
+        if !rule.HasAttributes() {
+            err = fmt.Errorf("deduplication not valid (no constraints)")
+            return
+        }
 
-		for _, a := range rule.Attributes() {
-			if a == "" {
-				err = fmt.Errorf("deduplication not valid (invalid field)")
-				return
-			}
-		}
+        for _, a := range rule.Attributes() {
+            if a == "" {
+                err = fmt.Errorf("deduplication not valid (invalid field)")
+                return
+            }
+        }
 
-		return
-	})
+        return
+    })
 }
 
 func (c DeDupRuleConstraint) HasMultiValue() bool {
-	switch c.MultiValue {
-	case oneOf, equal:
-		return true
-	default:
-		return false
-	}
+    switch c.MultiValue {
+    case oneOf, equal:
+        return true
+    default:
+        return false
+    }
 }
 
 func (c DeDupRuleConstraint) IsAllEqual() bool {
-	return c.MultiValue == equal
+    return c.MultiValue == equal
 }
 
 func (c DeDupRuleConstraint) IsOneOf() bool {
-	return c.MultiValue == oneOf
+    return c.MultiValue == oneOf
 }
 
 func (v *RecordValueErrorSet) SetMetaID(id uint64) {
-	if v.IsValid() {
-		return
-	}
+    if v.IsValid() {
+        return
+    }
 
-	for _, val := range v.Set {
-		if val.Meta != nil {
-			if _, ok := val.Meta["id"]; !ok {
-				val.Meta["id"] = cast.ToString(id)
-			}
-		}
-	}
+    for _, val := range v.Set {
+        if val.Meta != nil {
+            if _, ok := val.Meta["id"]; !ok {
+                val.Meta["id"] = cast.ToString(id)
+            }
+        }
+    }
 }
 
 func (v *RecordValueErrorSet) HasStrictErrors() bool {
-	return v.HasKind(deDupError.String())
+    return v.HasKind(deDupError.String())
 }
 
 // distinct only list the different (distinct) values
 func distinct(input []string) (out []string) {
-	keys := make(map[string]bool)
-	for _, val := range input {
-		if _, ok := keys[val]; !ok {
-			keys[val] = true
-			out = append(out, val)
-		}
-	}
-	return
+    keys := make(map[string]bool)
+    for _, val := range input {
+        if _, ok := keys[val]; !ok {
+            keys[val] = true
+            out = append(out, val)
+        }
+    }
+    return
 }
 
 // matchValue will check if the input matches with target string as per the modifier
 func matchValue(modifier DeDupValueModifier, input string, target string) bool {
-	switch modifier {
-	case ignoreCase:
-		return str.Match(input, target, str.CaseInSensitiveMatch)
-	case caseSensitive:
-		return str.Match(input, target, str.CaseSensitiveMatch)
-	case fuzzyMatch:
-		return str.Match(input, target, str.LevenshteinDistance)
-	case soundsLike:
-		return str.Match(input, target, str.Soundex)
-	default:
-		// ignoreCase as default, if not specified
-		return str.Match(input, target, str.CaseInSensitiveMatch)
-	}
+    switch modifier {
+    case ignoreCase:
+        return str.Match(input, target, str.CaseInSensitiveMatch)
+    case caseSensitive:
+        return str.Match(input, target, str.CaseSensitiveMatch)
+    case fuzzyMatch:
+        return str.Match(input, target, str.LevenshteinDistance)
+    case soundsLike:
+        return str.Match(input, target, str.Soundex)
+    default:
+        // ignoreCase as default, if not specified
+        return str.Match(input, target, str.CaseInSensitiveMatch)
+    }
+}
+
+func recordValueFrequencyMap(rvFreqMap map[string]int, c DeDupValueModifier, vv RecordValueSet) (values []string) {
+    for _, v := range vv {
+        values = append(values, v.Value)
+
+        if c == ignoreCase {
+            v.Value = strings.ToLower(v.Value)
+        }
+
+        rvFreqMap[v.Value]++
+    }
+
+    return values
+}
+
+func matchRecordValueFrequencyMap(a, b map[string]int) (ok bool) {
+    for k, keyCount := range a {
+        _, ok = b[k]
+        if !ok || keyCount != b[k] {
+            return false
+        }
+    }
+
+    return true
 }
diff --git a/server/compose/types/record_detect_duplicates_test.go b/server/compose/types/record_detect_duplicates_test.go
index 95be7f029..34c08aeb2 100644
--- a/server/compose/types/record_detect_duplicates_test.go
+++ b/server/compose/types/record_detect_duplicates_test.go
@@ -38,6 +38,16 @@ func TestDeDupRule_checkCaseSensitiveDuplication(t *testing.T) {
 				rule: rule1,
 				rec: Record{
 					ID: 1,
+					module: &Module{
+						ID: 1,
+						Fields: ModuleFieldSet{
+							&ModuleField{
+								Name:  "name",
+								Kind:  "String",
+								Multi: false,
+							},
+						},
+					},
 					Values: RecordValueSet{
 						&RecordValue{
 							RecordID: 1,
@@ -57,7 +67,7 @@ func TestDeDupRule_checkCaseSensitiveDuplication(t *testing.T) {
 					Set: []RecordValueError{
 						{
 							Kind:    deDupError.String(),
-							Message: rule1.IssueMessage(),
+							Message: rule1.IssueMessage("test"),
 							Meta: map[string]interface{}{
 								"field":         "name",
 								"value":         "test",
@@ -74,8 +84,294 @@ func TestDeDupRule_checkCaseSensitiveDuplication(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			gotOut := tt.rule.checkCaseSensitiveDuplication(ctx, ls, tt.rec, tt.vv)
-			req.Equal(tt.wantOut, gotOut, "checkCaseSensitiveDuplication() = %v, want %v", gotOut, tt.wantOut)
+			gotOut := tt.rule.checkDuplication(ctx, ls, tt.rec, tt.vv)
+			req.Equal(tt.wantOut, gotOut, "checkDuplication() = %v, want %v", gotOut, tt.wantOut)
+		})
+	}
+}
+
+func TestDedupRule_checkMultiValueEqualDuplication(t *testing.T) {
+	var (
+		req = require.New(t)
+		ctx = context.Background()
+		ls  = locale.Global()
+
+		rule1 = DeDupRule{
+			Name:   "",
+			Strict: true,
+			ConstraintSet: []*DeDupRuleConstraint{
+				{
+					Attribute:  "name",
+					Modifier:   caseSensitive,
+					MultiValue: equal,
+				},
+			},
+		}
+
+		rule2 = DeDupRule{
+			Name:   "ignore case rule",
+			Strict: true,
+			ConstraintSet: []*DeDupRuleConstraint{
+				{
+					Attribute:  "name",
+					Modifier:   ignoreCase,
+					MultiValue: equal,
+				},
+			},
+		}
+
+		numberRule = DeDupRule{
+			Name:   "number rule",
+			Strict: true,
+			ConstraintSet: []*DeDupRuleConstraint{
+				{
+					Attribute:  "count",
+					Modifier:   ignoreCase,
+					MultiValue: equal,
+				},
+			},
+		}
+
+		locationRule = DeDupRule{
+			Name:   "location rule",
+			Strict: true,
+			ConstraintSet: []*DeDupRuleConstraint{
+				{
+					Attribute:  "location",
+					Modifier:   ignoreCase,
+					MultiValue: equal,
+				},
+			},
+		}
+
+		tests = []struct {
+			name    string
+			rule    DeDupRule
+			rec     Record
+			vv      RecordValueSet
+			wantOut *RecordValueErrorSet
+		}{
+			{
+				name: "no duplication",
+				rule: rule1,
+				rec: Record{
+					ID: 1,
+					module: &Module{
+						ID: 1,
+						Fields: ModuleFieldSet{
+							&ModuleField{
+								Name:  "name",
+								Kind:  "String",
+								Multi: true,
+							},
+						},
+					},
+					Values: RecordValueSet{
+						&RecordValue{
+							RecordID: 1,
+							Name:     "name",
+							Value:    "test",
+						},
+						&RecordValue{
+							RecordID: 1,
+							Name:     "name",
+							Value:    "test test",
+						},
+					},
+				},
+				vv: RecordValueSet{
+					&RecordValue{
+						RecordID: 0,
+						Name:     "name",
+						Value:    "test",
+					},
+					&RecordValue{
+						RecordID: 0,
+						Name:     "name",
+						Value:    "test test",
+					},
+				},
+				wantOut: &RecordValueErrorSet{
+					Set: []RecordValueError{
+						{
+							Kind:    deDupError.String(),
+							Message: rule1.IssueMultivalueMessage([]string{"test", "test test"}),
+							Meta: map[string]interface{}{
+								"field":         "name",
+								"dupValueField": "name",
+								"rule":          rule1.String(),
+							},
+						},
+					},
+				},
+			},
+			{
+				name: "no duplication",
+				rule: rule2,
+				rec: Record{
+					ID: 1,
+					module: &Module{
+						ID: 1,
+						Fields: ModuleFieldSet{
+							&ModuleField{
+								Name:  "name",
+								Kind:  "String",
+								Multi: true,
+							},
+						},
+					},
+					Values: RecordValueSet{
+						&RecordValue{
+							RecordID: 1,
+							Name:     "name",
+							Value:    "test",
+						},
+						&RecordValue{
+							RecordID: 1,
+							Name:     "name",
+							Value:    "test tEst",
+						},
+					},
+				},
+				vv: RecordValueSet{
+					&RecordValue{
+						RecordID: 0,
+						Name:     "name",
+						Value:    "test",
+					},
+					&RecordValue{
+						RecordID: 0,
+						Name:     "name",
+						Value:    "Test Test",
+					},
+				},
+				wantOut: &RecordValueErrorSet{
+					Set: []RecordValueError{
+						{
+							Kind:    deDupError.String(),
+							Message: rule2.IssueMultivalueMessage([]string{"test", "test tEst"}),
+							Meta: map[string]interface{}{
+								"field":         "name",
+								"dupValueField": "name",
+								"rule":          rule2.String(),
+							},
+						},
+					},
+				},
+			},
+			{
+				name: "no duplication",
+				rule: numberRule,
+				rec: Record{
+					ID: 1,
+					module: &Module{
+						ID: 1,
+						Fields: ModuleFieldSet{
+							&ModuleField{
+								Name:  "count",
+								Multi: true,
+							},
+						},
+					},
+					Values: RecordValueSet{
+						&RecordValue{
+							RecordID: 1,
+							Name:     "count",
+							Value:    "234",
+						},
+						&RecordValue{
+							RecordID: 1,
+							Name:     "count",
+							Value:    "897",
+						},
+					},
+				},
+				vv: RecordValueSet{
+					&RecordValue{
+						RecordID: 0,
+						Name:     "count",
+						Value:    "897",
+					},
+					&RecordValue{
+						RecordID: 0,
+						Name:     "count",
+						Value:    "234",
+					},
+				},
+				wantOut: &RecordValueErrorSet{
+					Set: []RecordValueError{
+						{
+							Kind:    deDupError.String(),
+							Message: numberRule.IssueMultivalueMessage([]string{"234", "897"}),
+							Meta: map[string]interface{}{
+								"field":         "count",
+								"dupValueField": "count",
+								"rule":          numberRule.String(),
+							},
+						},
+					},
+				},
+			},
+			{
+				name: "no duplication",
+				rule: locationRule,
+				rec: Record{
+					ID: 1,
+					module: &Module{
+						ID: 1,
+						Fields: ModuleFieldSet{
+							&ModuleField{
+								Name:  "location",
+								Multi: true,
+							},
+						},
+					},
+					Values: RecordValueSet{
+						&RecordValue{
+							RecordID: 1,
+							Name:     "location",
+							Value:    "{\"coordinates\":[-6.7833479,20.3768206]}",
+						},
+						&RecordValue{
+							RecordID: 1,
+							Name:     "location",
+							Value:    "{\"coordinates\":[0.7833479,10.3768206]}",
+						},
+					},
+				},
+				vv: RecordValueSet{
+					&RecordValue{
+						RecordID: 0,
+						Name:     "location",
+						Value:    "{\"coordinates\":[0.7833479,10.3768206]}",
+					},
+					&RecordValue{
+						RecordID: 0,
+						Name:     "location",
+						Value:    "{\"coordinates\":[-6.7833479,20.3768206]}",
+					},
+				},
+				wantOut: &RecordValueErrorSet{
+					Set: []RecordValueError{
+						{
+							Kind:    deDupError.String(),
+							Message: locationRule.IssueMultivalueMessage([]string{"{\"coordinates\":[-6.7833479,20.3768206]}", "{\"coordinates\":[0.7833479,10.3768206]}"}),
+							Meta: map[string]interface{}{
+								"field":         "location",
+								"dupValueField": "location",
+								"rule":          locationRule.String(),
+							},
+						},
+					},
+				},
+			},
+		}
+	)
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotOut := tt.rule.checkDuplication(ctx, ls, tt.rec, tt.vv)
+			req.Equal(tt.wantOut, gotOut, "checkDuplication() = %v, want %v", gotOut, tt.wantOut)
 		})
 	}
 }