Reclassification of Unapplied AR Receipt to AP After Period Close

Summary:

There are open unapplied receipts on receivable, where the incoming payment belongs to supplier. 
When the month we received payment in is closed in ERP (Jan), business is  not able to reverse the receipt and post against supplier account with use of manual created CM and external transaction.

Since the receipt as already accounted, there is not provision to reverse the transaction.

We need a solution to be able to reclassify the accounting from AR to AP in new period without affecting the bank. Just internal transactions to move balance from AR to AP, but we also need to specify net and Tax amount.