Whenever there's an abend encountered in running a PL/1 program u'll
receive an ONCODE condition in the spool. The most common oncodes are 612(invalid data type conversion), 10(due to some name condition),
8094(protection exception) etc.
You can refer to the link http://www.mayeruli.de/krimskrams/oncode_en.html
it has all the common oncode conditions listed in it.