I set the "billing" parameter instead of "cpu" parameter for
"GrpTRESMins" and it is working as expected.
>>
[testfac3@login04 ~]$ sacctmgr modify user name=testuser100
Account=testfac3_imf set GrpTRESMins=billing=0
[testuser100@login04 testuser100]$ scontrol show assoc users=testuser100
acc
Thanks Ole for pointing to necessary documents.
So Do you mean to say I need to configure the "billing" parameter instead
of "GrpTRESMins" .
>>
[testuser100@login04 3072]$ scontrol show assoc users=testuser100
accounts=testfac3_imf flags=assoc|grep GrpTRESMins
GrpTRESMins=cpu=0(88),mem=N(380538)