Batch, IMS and TSO applications containing CMP modules may fail to execute successfully.
PTF RO93797 has the following fix:
The version of TIRLGLOD used to call Compatibility (CMP) modules in
Batch, IMS and TSO applications (TIRLILOD) contains a static call to
IGZCXCC. This can cause upward compatibility problems when moving
from one release of Language Environment (LE) to another. Problems
have been reported in applications that contain a mixture of LE 2.1
and earlier LE releases.