VALCK= parameter for procedures

Use the VALCK= parameter in procedure to specify the validity-check option. Valid values are 0, and 1. The default is 0.

0: Do not check the validity of addresses in the user's call list. This is the default.
1: Check the validity of the addresses in the user's call list.

An address is invalid if it is either lower than the lowest address not in the z/OS® nucleus or higher than the highest address in virtual storage.