SAP Lock Object issue

Hello Everyone

i have Z table - ZSALE_AUTO for processing automatic sale order processing through BAPI 'BAPI_SALESORDER_CREATEFROMDAT2', I create lock object for ztable on field KUNNR and BSTKD, ENQUEUE function is locking entries successfully but when the BAPI runs - lock entries deletes automatically from SM12. how i can overcome this issue. i want to release entries with DEQUEUE function.