I have one scenario, client want to book accrual incentive as the sales is done in a particular mont

Book accrual incentive as the sales is done in a particular month But payment made as resource eligible for the incentive . and minus from accrued incentive amount that is paid. in addition to this if particular time period gone then -ve entry book against accrued incentive , for example in Jan sale done 50000 and accrued incentive amount calculated 5000  eligibility criteria is payment with in three month in first month for 2 resource payment received and incentive paid 1000 now accrued incentive become 4000 ... and if after 3 month no remaining payment received then record -4000 against 4000 accrued incentive.