diff --git a/compose/service/module.go b/compose/service/module.go
index 10ce1f68b..cef546a6b 100644
--- a/compose/service/module.go
+++ b/compose/service/module.go
@@ -1384,15 +1384,15 @@ func moduleSystemFieldsToAttributes(mod *types.Module) (out dal.AttributeSet, er
 	return append(out,
 		dal.PrimaryAttribute(sysID, mfc(colSysID, sysEnc.ID)),
 		dal.FullAttribute(sysModuleID, &dal.TypeID{}, mfc(colSysModuleID, sysEnc.ModuleID)),
-		dal.FullAttribute(sysDeletedBy, &dal.TypeID{Nullable: true}, mfc(colSysDeletedBy, sysEnc.DeletedBy)),
+		dal.FullAttribute(sysDeletedBy, &dal.TypeRef{RefModel: &dal.ModelRef{ResourceType: "corteza::system:user"}, Nullable: true}, mfc(colSysDeletedBy, sysEnc.DeletedBy)),
 		dal.FullAttribute(sysNamespaceID, &dal.TypeID{}, mfc(colSysNamespaceID, sysEnc.NamespaceID)),
 		dal.FullAttribute(sysRevision, &dal.TypeID{}, mfc(colSysRevision, sysEnc.Revision)),
 		dal.FullAttribute(sysMeta, &dal.TypeJSON{}, mfc(colSysMeta, sysEnc.Meta)),
-		dal.FullAttribute(sysOwnedBy, &dal.TypeID{}, mfc(colSysOwnedBy, sysEnc.OwnedBy)),
+		dal.FullAttribute(sysOwnedBy, &dal.TypeRef{RefModel: &dal.ModelRef{ResourceType: "corteza::system:user"}}, mfc(colSysOwnedBy, sysEnc.OwnedBy)),
 		dal.FullAttribute(sysCreatedAt, &dal.TypeTimestamp{}, mfc(colSysCreatedAt, sysEnc.CreatedAt)),
-		dal.FullAttribute(sysCreatedBy, &dal.TypeID{}, mfc(colSysCreatedBy, sysEnc.CreatedBy)),
+		dal.FullAttribute(sysCreatedBy, &dal.TypeRef{RefModel: &dal.ModelRef{ResourceType: "corteza::system:user"}}, mfc(colSysCreatedBy, sysEnc.CreatedBy)),
 		dal.FullAttribute(sysUpdatedAt, &dal.TypeTimestamp{Nullable: true}, mfc(colSysUpdatedAt, sysEnc.UpdatedAt)),
-		dal.FullAttribute(sysUpdatedBy, &dal.TypeID{Nullable: true}, mfc(colSysUpdatedBy, sysEnc.UpdatedBy)),
+		dal.FullAttribute(sysUpdatedBy, &dal.TypeRef{RefModel: &dal.ModelRef{ResourceType: "corteza::system:user"}, Nullable: true}, mfc(colSysUpdatedBy, sysEnc.UpdatedBy)),
 		dal.FullAttribute(sysDeletedAt, &dal.TypeTimestamp{Nullable: true}, mfc(colSysDeletedAt, sysEnc.DeletedAt)),
 	), nil
 }