The documentation states the following instructions for avoiding NULSER errors for archive datasets.
If the default value of NULSER might no longer be appropriate at a site. If this is the case, select an actual volume serial number residing in the ATL or VTS that CA MICS uses when pre-allocation of a tape file is needed. Put an indefinite expiration date on the volume so that it is available for any new datasets in the future.
How do you handle this if the site does not allow never expiring expiration dates?