The member TUNDB2xx in UTRPARM must contain an entry for each version of DB2 you wish to use with CA MAT.
TUNDB2xx defines the DB2 load library that will be dynamically allocated before connecting to a DB2 Subsystem.
As we can see on this member in UTRPARM installation library, there is an entry for each DB2 releases:
* DB2V810=DB2 8.1 SDSNLOAD *
* DB2V910=DB2 9.1 SDSNLOAD *
* DB2VA10=DB2 10.1 SDSNLOAD *
* DB2VB10=DB2 11.1 SDSNLOAD *
* DB2VC10=DB2 12.1 SDSNLOAD *