diff --git a/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php b/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
index c337a3adb..2af00b599 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/BusinessModel/CasesTest.php
@@ -9,6 +9,8 @@ use ProcessMaker\Model\AppDelay;
 use ProcessMaker\Model\Application;
 use ProcessMaker\Model\Delegation;
 use ProcessMaker\Model\Documents;
+use ProcessMaker\Model\GroupUser;
+use ProcessMaker\Model\Groupwf;
 use ProcessMaker\Model\ListUnassigned;
 use ProcessMaker\Model\Process;
 use ProcessMaker\Model\ProcessUser;
@@ -483,4 +485,43 @@ class CasesTest extends TestCase
         // Asserts
         $this->assertNotTrue($result);
     }
+
+    /**
+     * It tests get users to reassign 
+     * 
+     * @covers \ProcessMaker\BusinessModel\Cases::usersToReassign()
+     * @test
+     */
+    public function it_should_test_users_to_reassign()
+    {
+        $process = Process::factory()->create();
+        $task = Task::factory()->create([
+            'PRO_UID' => $process->PRO_UID,
+            'TAS_ASSIGN_TYPE' => 'SELF_SERVICE',
+            'TAS_GROUP_VARIABLE' => '@@arrayOfusers'
+        ]);
+        $users = User::factory(3)->create();
+        $groupwf = Groupwf::factory()->create();
+
+        GroupUser::factory()->create([
+            'GRP_UID' => $groupwf->GRP_UID,
+            'GRP_ID' => $groupwf->GRP_ID,
+            'USR_UID' => $users[1]->USR_UID
+        ]);
+        GroupUser::factory()->create([
+            'GRP_UID' => $groupwf->GRP_UID,
+            'GRP_ID' => $groupwf->GRP_ID,
+            'USR_UID' => $users[2]->USR_UID
+        ]);
+        
+        $application = Application::factory()->create([
+            'PRO_UID' => $process->PRO_UID,
+            'APP_DATA' =>  serialize(['arrayOfusers' => [$groupwf->GRP_UID, $users[0]->USR_UID]])
+        ]);
+
+        $cases = new Cases();
+        $result = $cases->usersToReassign($users[0]['USR_UID'], $task->TAS_UID, $application->APP_UID);
+        // Asserts
+        $this->assertCount(3, $result['data']);
+    }
 }
diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php b/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
index a376a3314..abf64e254 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Cases.php
@@ -53,9 +53,12 @@ use ProcessMaker\Model\AppNotes as Notes;
 use ProcessMaker\Model\AppTimeoutAction;
 use ProcessMaker\Model\Delegation;
 use ProcessMaker\Model\Documents;
+use ProcessMaker\Model\Groupwf;
+use ProcessMaker\Model\GroupUser;
 use ProcessMaker\Model\ListUnassigned;
 use ProcessMaker\Model\Triggers;
 use ProcessMaker\Model\ProcessUser;
+use ProcessMaker\Model\Task;
 use ProcessMaker\Model\User;
 use ProcessMaker\Plugins\PluginRegistry;
 use ProcessMaker\Services\Api;
@@ -2761,6 +2764,75 @@ class Cases
         }
     }
 
+    /**
+     * Get Users to reassign
+     *
+     * @param string $userUid Unique id of User (User logged)
+     * @param string $taskUid Unique id of Task
+     * @param string $appUid Unique id of Application
+     *
+     * @return array Return Users to reassign
+     * @throws Exception
+     */
+    public function usersToReassign(
+        $userUid,
+        $taskUid,
+        $appUid
+    ) {
+        $task = Task::where('TAS_UID', '=', $taskUid)->first();
+        $type = $task->TAS_ASSIGN_TYPE;
+        $variable = $task->TAS_GROUP_VARIABLE;
+        $result = [];
+
+        if ($type === 'SELF_SERVICE' && $variable !== '') {
+            $variable = substr($variable, 2);
+            $case = new ClassesCases();
+            $app = new ModelApplication();
+            $fields = $app::where('APP_UID', '=', $appUid)->first();
+            $data = $case::unserializeData($fields->APP_DATA);
+
+            $row = [];
+            $groups = new GroupUser();
+            $groupwf = new Groupwf();
+            
+            if (!empty($data[$variable])) {
+                foreach ($data[$variable] as $uid) {
+                    $group = $groupwf::where('GRP_UID', '=', $uid)->first();
+                    if (!empty($group)) {
+                        $users = $groups::where('GRP_UID', '=', $uid)->get()->toArray();
+                        foreach ($users as $data) {
+                            $row[] = $data['USR_UID'];
+                        }
+                    } else {
+                        $row[] = $uid;
+                    }
+                }
+            }
+            
+            $user = new User();
+            $users = [];
+            foreach ($row as $data) {
+                $obj = $user::where('USR_UID', '=', $data)->Active()->first();
+                if (!is_null($obj) && $obj->USR_USERNAME !== "") {
+                    $users[] = $obj;
+                }
+            }
+
+            foreach ($users as $user) {
+                $result[] = [
+                    "USR_UID" => $user->USR_UID,
+                    "USR_USERNAME" => $user->USR_USERNAME,
+                    "USR_FIRSTNAME" => $user->USR_FIRSTNAME,
+                    "USR_LASTNAME"=> $user->USR_LASTNAME
+                ];
+            }
+
+        } else {
+            $result = $this->getUsersToReassign($userUid, $taskUid)['data'];
+        }
+        return ['data' => $result];
+    }
+
     /**
      * Get Users to reassign
      *
diff --git a/workflow/engine/src/ProcessMaker/Services/Api/Cases.php b/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
index 216ad4c77..60c459d79 100644
--- a/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
+++ b/workflow/engine/src/ProcessMaker/Services/Api/Cases.php
@@ -1093,6 +1093,33 @@ class Cases extends Api
         }
     }
 
+
+
+    /**
+     * Get users to reassign or assign
+     *
+     * @url GET /:task_uid/:app_uid/userstoreassign
+     *
+     * @param string $task_uid
+     * @param string $app_uid
+     *
+     * @return array
+     * @throws RestException
+     *
+     * @access protected
+     * @class AccessControl {@permission PM_CASES}
+     */
+    public function usersToReasign($task_uid, $app_uid)
+    {
+        try {
+            $usr_uid = $this->getUserId();
+            $cases = new BmCases();
+            return $cases->usersToReassign($usr_uid, $task_uid, $app_uid);
+        } catch (Exception $e) {
+            throw new RestException(Api::STAT_APP_EXCEPTION, $e->getMessage());
+        }
+    }
+
     /**
      * Execute trigger in a case.
      *