diff --git a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
index 56e21f0ae..ebef2012f 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
@@ -3332,13 +3332,13 @@ class DelegationTest extends TestCase
         //Create task
         $task = Task::factory()->create();
         //Create a delegation
-        Delegation::factory()->create([
+        $delegation = Delegation::factory()->create([
             'DEL_THREAD_STATUS' => 'OPEN',
             'DEL_FINISH_DATE' => null,
             'APP_NUMBER' => $application->APP_NUMBER,
             'TAS_UID' => $task->TAS_UID,
         ]);
-        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $result = Delegation::getOpenThread($application->APP_NUMBER, $delegation->DEL_INDEX);
         $this->assertEquals($application->APP_NUMBER, $result['APP_NUMBER']);
     }
 
@@ -3357,12 +3357,12 @@ class DelegationTest extends TestCase
         //Create task
         $task = Task::factory()->create();
         //Create a delegation
-        Delegation::factory()->create([
+        $delegation = Delegation::factory()->create([
             'DEL_THREAD_STATUS' => 'CLOSED',
             'APP_NUMBER' => $application->APP_NUMBER,
             'TAS_UID' => $task->TAS_UID,
         ]);
-        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $result = Delegation::getOpenThread($application->APP_NUMBER, $delegation->DEL_INDEX);
         $this->assertEmpty($result);
     }
 
@@ -3383,12 +3383,12 @@ class DelegationTest extends TestCase
         //Create task
         $task = Task::factory()->create();
         //Create a delegation
-        Delegation::factory()->create([
+        $delegation = Delegation::factory()->create([
             'DEL_THREAD_STATUS' => 'CLOSED',
             'APP_NUMBER' => $application->APP_NUMBER,
             'TAS_UID' => $task->TAS_UID,
         ]);
-        $result = Delegation::getOpenThreads($application->APP_NUMBER, $task->TAS_UID);
+        $result = Delegation::getOpenThread($application->APP_NUMBER, $delegation->DEL_INDEX);
         $this->assertEmpty($result);
     }
 
diff --git a/workflow/engine/methods/cases/casesListExtJs.php b/workflow/engine/methods/cases/casesListExtJs.php
index 71e61acc6..d8d816a03 100644
--- a/workflow/engine/methods/cases/casesListExtJs.php
+++ b/workflow/engine/methods/cases/casesListExtJs.php
@@ -374,6 +374,7 @@ function getReassignList()
     $caseReaderFields[] = ['name' => 'APP_NUMBER'];
     $caseReaderFields[] = ['name' => 'APP_TITLE'];
     $caseReaderFields[] = ['name' => 'APP_UID'];
+    $caseReaderFields[] = ['name' => 'DEL_INDEX'];
     $caseReaderFields[] = ['name' => 'USR_UID'];
     $caseReaderFields[] = ['name' => 'APP_TAS_TITLE'];
     $caseReaderFields[] = ['name' => 'APP_PRO_TITLE'];
diff --git a/workflow/engine/methods/cases/proxySaveReassignCasesList.php b/workflow/engine/methods/cases/proxySaveReassignCasesList.php
index 958f6bdb8..9e167c12f 100644
--- a/workflow/engine/methods/cases/proxySaveReassignCasesList.php
+++ b/workflow/engine/methods/cases/proxySaveReassignCasesList.php
@@ -26,7 +26,7 @@ if (empty($dataPost)) {
     foreach ($dataPost as $data) {
         // It was supposed will return only one thread related to the task
         // todo: implement the reassign case for multi instance task
-        $openThreads = Delegation::getOpenThreads($data->APP_NUMBER, $data->TAS_UID);
+        $openThreads = Delegation::getOpenThread($data->APP_NUMBER, $data->DEL_INDEX);
         if (!empty($openThreads)) {
             // Get the user information assigned in the index
             $currentUsrUid = Delegation::getCurrentUser($openThreads['APP_NUMBER'], $openThreads['DEL_INDEX']);
diff --git a/workflow/engine/src/ProcessMaker/Model/Delegation.php b/workflow/engine/src/ProcessMaker/Model/Delegation.php
index 78c6a0338..c08b6a008 100644
--- a/workflow/engine/src/ProcessMaker/Model/Delegation.php
+++ b/workflow/engine/src/ProcessMaker/Model/Delegation.php
@@ -1847,25 +1847,25 @@ class Delegation extends Model
      * Return the open thread related to the task
      *
      * @param int $appNumber, Case number
-     * @param string $tasUid, The task uid
+     * @param int $delIndex
      *
      * @return array
      */
-    public static function getOpenThreads(int $appNumber, string $tasUid)
+    public static function getOpenThread(int $appNumber, int $delIndex)
     {
         $query = Delegation::query()->select();
         $query->where('DEL_THREAD_STATUS', 'OPEN');
         $query->where('DEL_FINISH_DATE', null);
         $query->where('APP_NUMBER', $appNumber);
-        $query->where('TAS_UID', $tasUid);
+        $query->where('DEL_INDEX', $delIndex);
         $results = $query->get();
 
-        $arrayOpenThreads = [];
-        $results->each(function ($item, $key) use (&$arrayOpenThreads) {
-            $arrayOpenThreads = $item->toArray();
+        $arrayOpenThread = [];
+        $results->each(function ($item, $key) use (&$arrayOpenThread) {
+            $arrayOpenThread = $item->toArray();
         });
 
-        return $arrayOpenThreads;
+        return $arrayOpenThread;
     }
 
     /**