MBCX abend AZI4 in program DFHMIRS

Q:

What does an AZI4 abend from transaction MBCX abend AZI4 in program DFHMIRS mean?

A:

AZI4 says IRC has become unavailable. Sometimes the CICS region is waiting on a User Catalog to come available due to an enqueue held by another address space. Rerun the job after the enqueue is released.