Exception handler priority becomes important if you use both language-specific
error handling and ILE condition handlers. For an ILE RPG procedure, exception
handlers have the following priority:
Either an error indicator or an 'E' extender handler
MONITOR group
ILE condition handler
I/O error subroutine handler (for file errors) and Program error subroutine
handler (for all other errors)
RPG default handler for unhandled exceptions (cycle-main
procedure only)