We are getting PBCO errors on our journals in a fiscal calendar and cannot resolve

When trying to enter a percentage to accrue on the final cycles of the month, we are getting PBCO errors.  Our constants reflect the GL on the fiscal year starting in February (Month 2).   When we entered our accrual percent, it comes up with month 7 which is July in our case.  Where do change the month so the accrual recognized were are in the fiscal month of July but the calendar month of August.?  My understanding is the accrual of say 10% would accrue to the current month of August (month 7 in our case)  and reverse in the