diff --git a/workflow/engine/classes/class.wsBase.php b/workflow/engine/classes/class.wsBase.php
index 2df12068c..1d5f75d3c 100755
--- a/workflow/engine/classes/class.wsBase.php
+++ b/workflow/engine/classes/class.wsBase.php
@@ -3133,6 +3133,13 @@ class wsBase
                 $g->sessionVarRestore();
                 return $result;
             }
+            $oAppThread = new AppThread();
+            $cant = $oAppThread->countStatus($caseUid, 'OPEN');
+            if($cant > 1){
+                $result = new wsResponse( 100, G::LoadTranslation( "ID_CASE_CANCELLED_PARALLEL" ) );
+                $g->sessionVarRestore();
+                return $result;
+            }
 
             $case = new Cases();
             $case->cancelCase( $caseUid, $delIndex, $userUid );
diff --git a/workflow/engine/classes/model/AppThread.php b/workflow/engine/classes/model/AppThread.php
index 8da9a7013..fe9cf57ae 100755
--- a/workflow/engine/classes/model/AppThread.php
+++ b/workflow/engine/classes/model/AppThread.php
@@ -114,5 +114,15 @@ class AppThread extends BaseAppThread
             throw($oError);
         }
     }
+
+    public function countStatus($appUid, $status='OPEN'){
+        $c = new Criteria('workflow');
+        $c->clearSelectColumns();
+        $c->addSelectColumn( AppThreadPeer::APP_THREAD_PARENT );
+        $c->add(AppThreadPeer::APP_UID, $appUid );
+        $c->add(AppThreadPeer::APP_THREAD_STATUS , $status );
+        $cant = AppThreadPeer::doCount($c);
+        return $cant;
+    }
 }