How to handle Vendor refund received in AR for AP Voucher (one time vendor)

Hi,

I want to know the right way to handle refund received by AR team to post in AP and project side.

For Example: we created and paid the voucher in AP for $1000 and we are not going to business again with the vendor in future. We received some defective item and return it to the vendor and he has sent the check refund for $400 which is received by AR side and they created a deposit.

I want to confirm that it is synced in properly in system. Since refund is received in AR but AP shows that we have paid $1000 to the vendor which is not right amount. How can I make my reporting right or is there a way that AR deposit can synced with AP system.