diff --git a/workflow/engine/src/ProcessMaker/BusinessModel/Department.php b/workflow/engine/src/ProcessMaker/BusinessModel/Department.php
index 0c19e55c7..f240f994c 100644
--- a/workflow/engine/src/ProcessMaker/BusinessModel/Department.php
+++ b/workflow/engine/src/ProcessMaker/BusinessModel/Department.php
@@ -50,6 +50,27 @@ class Department
         }
     }
 
+    /**
+     * Verify if the User is not in a Department
+     *
+     * @param string $departmentUid
+     * @param string $userUid
+     *
+     * return void Throw exception user not exists
+     */
+    private function throwExceptionUserNotExistsInDepartment($departmentUid, $userUid)
+    {
+        try {
+            $user = \UsersPeer::retrieveByPK($userUid);
+
+            if (is_null($user) || $user->getDepUid() != $departmentUid) {
+                throw new \Exception(\G::LoadTranslation('ID_USER_NOT_EXIST_DEPARTMENT', [$userUid]));
+            }
+        } catch (\Exception $e) {
+            throw $e;
+        }
+    }
+
     /**
      * Verify if exists the title of a Department
      *
@@ -253,6 +274,8 @@ class Department
         $dep_uid = Validator::depUid($dep_uid);
         $usr_uid = Validator::usrUid($usr_uid);
 
+        $this->throwExceptionUserNotExistsInDepartment($dep_uid, $usr_uid);
+
         $dep = new \Department();
         $dep->load( $dep_uid );
         $manager = $dep->getDepManager();
diff --git a/workflow/engine/src/ProcessMaker/Services/Api/Department.php b/workflow/engine/src/ProcessMaker/Services/Api/Department.php
index 0ddf30dd3..6c78f01df 100644
--- a/workflow/engine/src/ProcessMaker/Services/Api/Department.php
+++ b/workflow/engine/src/ProcessMaker/Services/Api/Department.php
@@ -114,20 +114,19 @@ class Department extends Api
     }
 
     /**
-     * @url PUT /:dep_uid/unassign-user/:usr_uid
+     * @url DELETE /:dep_uid/unassign-user/:usr_uid
      *
      * @param string $dep_uid {@min 1}{@max 32}
      * @param string $usr_uid {@min 1}{@max 32}
      *
-     * @return array
+     * @status 200
      *
      */
-    public function doPutUnassignUser($dep_uid, $usr_uid)
+    public function doDeleteUnassignUser($dep_uid, $usr_uid)
     {
         try {
             $oDepartment = new \ProcessMaker\BusinessModel\Department();
-            $response = $oDepartment->unassignUser($dep_uid, $usr_uid);
-            return $response;
+            $oDepartment->unassignUser($dep_uid, $usr_uid);
         } catch (\Exception $e) {
             throw (new RestException(Api::STAT_APP_EXCEPTION, $e->getMessage()));
         }