When starting MSMMUF version 4.0 it fails with MULTI-USER ERROR - 1113
MSMMUF:DB00210I - MULTI-USER RUNNING AUTHORIZED - YES
MSMMUF:DB00212I - CA Datacom SQL r12 at service pack: SP0
MSMMUF:DB00205E - MULTI-USER ERROR - 1113
IEF450I MSMMUF MSMMUF - ABEND=S000 U0004 REASON=00000000 957
Multi-User abend is due to the Datacom subsystem that is older than version 11.0, in this case 10.0.
Should use an 11.0 subsystem which can be used with a R11 and R12 Multi-User in case a r10 Multi-User is still needed then the Datacom subsystem should be removed as a r10 MUF can not work with an 11.0 subsystem.