The CA PMO System Programmer Guide says that you can eliminate MIM1098 & MIM1099 messages by coding the CA MII exit ECMCONXT. That exit is missing from recent releases of CA MIM/MII.
CA MII has replaced several exits including ECMCONXT with an expanded set of more granular exits. We recommend that you reference the User Exits chapter in the CA MII Programming Guide. If you are uncertain about what exit(s) to use, we recommend that you contact CA MIM Technical Support for guidance to be sure that you implement the appropriate exit or combination of exits to accomplish your goal.