CA InterTest for CICS has the following installation requirements when being installed in the same region with TMON.
The following is stated in the installation guide.
To use CA InterTest for CICS with TMON, CA InterTest for CICS transactions must be excluded from the TMON Resource Limit (Time Out) Specification.
CA InterTest FOR CICS has a couple of long running service transactions.
These transactions must be excluded from TMON Resource Limit (Time Out) Specification. For example CA InterTest for CICS transaction ISER runs for the life of CICS or the VTAT transaction which manages users testing at breakpoints.
TMON may interrupt these transactions as hanging and purge them.
This will cause unpredictable results or CA InterTest for CICS may abend.