ASMMAI502E ACB error for APPLID `applid` - ACBERFLG `code`x

Explanation
 An OPEN or CLOSE for the  VTAM® application ID applid failed
 with the indicated ACBERFLG field from the ACB. If the ACBERFLG code
is x'5A', IDF attempts OPEN for up to 10 successive application IDs
(of the form ASMTLnnn) before issuing the message
and hence the reported applid may be one that is
not actually defined.

User response
 Determine from the reported ACBERFLG, why the
OPEN or CLOSE failed.