NOT ON EXCEPTION Phrase
If an exception condition does not occur (in other words, the called subprogram can be made available), control transfers to the called program. After control returns from the called program, the ON EXCEPTION phrase, if specified, is ignored, and control transfers to the end of the CALL statement (or to imperative-statement-2, if the NOT ON EXCEPTION phrase is specified).
If control transfers to imperative-statement-2, processing continues according to the rules for each statement specified in imperative-statement-2.
If a procedure-branching or conditional statement causing explicit transfer of control runs, control transfers according to the rules for that statement. Otherwise, once imperative-statement-2 has run, control transfers to the end of the CALL statement.
If you specify this phrase in conjunction with the ON OVERFLOW phrase, an error will result.