diff --git a/intaro.retailcrm/classes/general/RCrmActions.php b/intaro.retailcrm/classes/general/RCrmActions.php
index 351a4549..1ab08b0f 100644
--- a/intaro.retailcrm/classes/general/RCrmActions.php
+++ b/intaro.retailcrm/classes/general/RCrmActions.php
@@ -329,17 +329,6 @@ class RCrmActions
         );
     }
 
-    /**
-     * Returns true if provided externalId in new format (id_clientId)
-     *
-     * @param $externalId
-     * @return bool
-     */
-    public static function isNewExternalId($externalId)
-    {
-        return !(false === strpos($externalId, '_'));
-    }
-
     /**
      * Unserialize array
      *