Mixing MASK and NOMASK

There are many anomalies associated with maintaining a mixture of MASK and NOMASK ownerships and permissions. For example:

Ownerships entered under the old regime will not be found by TSS WHOOWNS or TSS WHOHAS under the new regime
Administration of resources defined under the previous regime may not be found by administration commands to REVOKE, REMOVE or to PERMIT or ADD

If you have a mixture of MASK and NOMASK resources:

You can administer old regime resources reliably only by modifying the RESCLASS back to the old MASK/NOMASK attribute
New regime resources cannot be administered until the RESCLASS is set back to its new regime value