Label Validation Suppression Exit

The validation suppression exit lets you suppress label validation. It is entered during open or EOV if:

volume security checking has been suppressed or
the volume label accessibility field contains an ASCII space character or
for Version 3 tapes, RACF accepts a volume and the accessibility field does not contain an uppercase letter from A through Z or
for Version 4 tapes, RACF accepts a volume and the accessibility field does not contain an uppercase letter from A through Z or one of the special characters !*"%&'()+,-./:;<=>?_ or a numeric 0 through 9.

Label validation can also be suppressed by the volume access exit. If you suppress label validation, the resulting volume might not meet the specifications of Version 3 or Version 4 standards, and therefore would require agreement between interchange parties.