diff --git a/packages/twenty-server/src/engine/api/common/common-query-runners/common-merge-many-query-runner.service.ts b/packages/twenty-server/src/engine/api/common/common-query-runners/common-merge-many-query-runner.service.ts
index 869c9ce882..c713ac7c80 100644
--- a/packages/twenty-server/src/engine/api/common/common-query-runners/common-merge-many-query-runner.service.ts
+++ b/packages/twenty-server/src/engine/api/common/common-query-runners/common-merge-many-query-runner.service.ts
@@ -33,7 +33,6 @@ import {
   GraphqlQueryRunnerException,
   GraphqlQueryRunnerExceptionCode,
 } from 'src/engine/api/graphql/graphql-query-runner/errors/graphql-query-runner.exception';
-import { ObjectRecordsToGraphqlConnectionHelper } from 'src/engine/api/graphql/graphql-query-runner/helpers/object-records-to-graphql-connection.helper';
 import { buildColumnsToReturn } from 'src/engine/api/graphql/graphql-query-runner/utils/build-columns-to-return';
 import { buildColumnsToSelect } from 'src/engine/api/graphql/graphql-query-runner/utils/build-columns-to-select';
 import { hasRecordFieldValue } from 'src/engine/api/graphql/graphql-query-runner/utils/has-record-field-value.util';
@@ -73,15 +72,11 @@ export class CommonMergeManyQueryRunnerService extends CommonBaseQueryRunnerServ
       recordsToMerge,
       priorityRecord.id,
       objectMetadataItemWithFieldMaps,
+      args.dryRun ?? false,
     );
 
     if (args.dryRun) {
-      return this.createDryRunResponse(
-        priorityRecord,
-        mergedData,
-        objectMetadataItemWithFieldMaps,
-        objectMetadataMaps,
-      );
+      return this.createDryRunResponse(priorityRecord, mergedData);
     }
 
     const idsToDelete = args.ids.filter((id) => id !== priorityRecord.id);
@@ -139,6 +134,9 @@ export class CommonMergeManyQueryRunnerService extends CommonBaseQueryRunnerServ
     const recordsToMerge = await context.repository.find({
       where: { id: In(args.ids) },
       select: columnsToSelect,
+      ...(args.dryRun
+        ? { relations: args.selectedFieldsResult.relations }
+        : {}),
     });
 
     if (recordsToMerge.length !== args.ids.length) {
@@ -175,6 +173,7 @@ export class CommonMergeManyQueryRunnerService extends CommonBaseQueryRunnerServ
     recordsToMerge: ObjectRecord[],
     priorityRecordId: string,
     objectMetadataItemWithFieldMaps: ObjectMetadataItemWithFieldMaps,
+    isDryRun = false,
   ): Partial<ObjectRecord> {
     const mergedResult: Partial<ObjectRecord> = {};
 
@@ -217,10 +216,18 @@ export class CommonMergeManyQueryRunnerService extends CommonBaseQueryRunnerServ
           return;
         }
 
+        const relationType =
+          isDryRun && fieldMetadata.type === FieldMetadataType.RELATION
+            ? (fieldMetadata.settings as FieldMetadataRelationSettings)
+                ?.relationType
+            : undefined;
+
         mergedResult[fieldName] = mergeFieldValues(
           fieldMetadata.type,
           recordsWithValues,
           priorityRecordId,
+          isDryRun,
+          relationType,
         );
       }
     });
@@ -242,25 +249,15 @@ export class CommonMergeManyQueryRunnerService extends CommonBaseQueryRunnerServ
   private createDryRunResponse(
     priorityRecord: ObjectRecord,
     mergedData: Partial<ObjectRecord>,
-    objectMetadataItemWithFieldMaps: ObjectMetadataItemWithFieldMaps,
-    objectMetadataMaps: ObjectMetadataMaps,
   ): ObjectRecord {
-    const dryRunRecord = {
+    const dryRunRecord: ObjectRecord = {
       ...priorityRecord,
       ...mergedData,
       id: uuidv4(),
       deletedAt: new Date().toISOString(),
-    } as ObjectRecord;
+    };
 
-    const typeORMObjectRecordsParser =
-      new ObjectRecordsToGraphqlConnectionHelper(objectMetadataMaps);
-
-    return typeORMObjectRecordsParser.processRecord({
-      objectRecord: dryRunRecord,
-      objectName: objectMetadataItemWithFieldMaps.nameSingular,
-      take: 1,
-      totalCount: 1,
-    });
+    return dryRunRecord;
   }
 
   private async updatePriorityRecord(
diff --git a/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-field-values.util.ts b/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-field-values.util.ts
index bccd850dbd..900c4f48d6 100644
--- a/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-field-values.util.ts
+++ b/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-field-values.util.ts
@@ -1,4 +1,4 @@
-import { FieldMetadataType } from 'twenty-shared/types';
+import { FieldMetadataType, type RelationType } from 'twenty-shared/types';
 
 import { type EmailsMetadata } from 'src/engine/metadata-modules/field-metadata/composite-types/emails.composite-type';
 import { type LinksMetadata } from 'src/engine/metadata-modules/field-metadata/composite-types/links.composite-type';
@@ -8,18 +8,32 @@ import { mergeArrayFieldValues } from './merge-array-field-values.util';
 import { mergeEmailsFieldValues } from './merge-emails-field-values.util';
 import { mergeLinksFieldValues } from './merge-links-field-values.util';
 import { mergePhonesFieldValues } from './merge-phones-field-values.util';
+import { mergeRelationFieldValuesForDryRunRecord } from './merge-relation-field-values-for-dry-run-record.util';
 import { selectPriorityFieldValue } from './select-priority-field-value.util';
 
 export const mergeFieldValues = (
   fieldType: FieldMetadataType,
   recordsWithValues: { value: unknown; recordId: string }[],
   priorityRecordId: string,
+  isDryRun = false,
+  relationType?: RelationType,
 ): unknown => {
   switch (fieldType) {
     case FieldMetadataType.ARRAY:
     case FieldMetadataType.MULTI_SELECT:
       return mergeArrayFieldValues(recordsWithValues);
 
+    case FieldMetadataType.RELATION:
+      if (isDryRun) {
+        return mergeRelationFieldValuesForDryRunRecord(
+          recordsWithValues,
+          relationType,
+          priorityRecordId,
+        );
+      }
+
+      return selectPriorityFieldValue(recordsWithValues, priorityRecordId);
+
     case FieldMetadataType.EMAILS:
       return mergeEmailsFieldValues(
         recordsWithValues as { value: EmailsMetadata; recordId: string }[],
diff --git a/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-relation-field-values-for-dry-run-record.util.ts b/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-relation-field-values-for-dry-run-record.util.ts
new file mode 100644
index 0000000000..586bb6f28c
--- /dev/null
+++ b/packages/twenty-server/src/engine/api/graphql/graphql-query-runner/utils/merge-relation-field-values-for-dry-run-record.util.ts
@@ -0,0 +1,37 @@
+import { type ObjectRecord, RelationType } from 'twenty-shared/types';
+import { isDefined } from 'twenty-shared/utils';
+
+import { selectPriorityFieldValue } from 'src/engine/api/graphql/graphql-query-runner/utils/select-priority-field-value.util';
+
+export const mergeRelationFieldValuesForDryRunRecord = (
+  recordsWithValues: { value: unknown; recordId: string }[],
+  relationType: RelationType | undefined,
+  priorityRecordId: string,
+): ObjectRecord | ObjectRecord[] | null => {
+  if (relationType === RelationType.ONE_TO_MANY) {
+    return mergeOneToManyRelationArrays(recordsWithValues);
+  }
+
+  return selectPriorityFieldValue(
+    recordsWithValues as { value: ObjectRecord | null; recordId: string }[],
+    priorityRecordId,
+  );
+};
+
+const mergeOneToManyRelationArrays = (
+  recordsWithValues: { value: unknown; recordId: string }[],
+): ObjectRecord[] => {
+  const uniqueRelationsMap = new Map<string, ObjectRecord>();
+
+  recordsWithValues.forEach(({ value }) => {
+    if (Array.isArray(value)) {
+      value.forEach((relation: ObjectRecord) => {
+        if (isDefined(relation?.id)) {
+          uniqueRelationsMap.set(relation.id, relation);
+        }
+      });
+    }
+  });
+
+  return Array.from(uniqueRelationsMap.values());
+};