I am not clear what exactly your issue is :-?
Assuming that you have generate 1.5 days per month (if probation happens, normally just only 1st month employee joined company, you don't want create Absence Quota. Just simply like that:
- check Probation in V_T559L
- creating rounding rule: 0 -> 1.4999 => target value is 0. So on the first month joined (if employee joined from 2nd day until EOM), he gets 0 days in Abnsece Quota.
Anyway please look at necessary documents and useful example in my link: Absence Quota
It will help you!
Regards!
Woody