Just adding to your reply, it is fine that we have to check the last week (table V_T549X) , but when it comes to IT0014, please tell me, how will you manage in Payment dates.
Suppose, if you have given "interval in periods" as 4, means after every 4 periods, this payment or deduction will be made or if you 1st payment date & interval/unit, and suppose, you have assign as current month payment date (which is last day of the month) and interval/unit as 01 month, in that case also, system will make payment/deduction on date that you assigned in 1st payment date.
Please tell me, how will adjust payment dates in IT0014 so that payment / deduction will be happened only in last period.
