Checking locks in RVKRED77 / RVKREDSP / Z_RVKRED77_PARALLEL

We're facing challenges in credit master reorgs (I'm posting this for a colleague, so please bear with me).

After looking at relevant notes (363343, 400311, 755395) and searching the forum, I wonder if anyone has found logic missing from the SAP suggested code. When we run this, there may be a condition that does not permit the tables to be locked, so we wait and start the entire job again. Within Z_RVKRED77_PARALLEL, these enqueue locks are tried:

CALL FUNCTION 'ENQUEUE_EVVBAKE'
       EXPORTING
            vbeln = con_enqueue_batch.
  CALL FUNCTION 'ENQUEUE_EVVBAKE'.
  CALL FUNCTION 'ENQUEUE_EVVBLKE'.
  CALL FUNCTION 'ENQUEUE_EVVBRKE'.

(...)

  IF NOT variant1 IS INITIAL.
    PERFORM fill_joblist USING variant1 user '1'.
  ENDIF.

But there is no check on success/failure. I was thinking of adding a "delay and retry" within this block so we could attempt to continue at that point. Good, bad, crazy?

Thanks,

Jim