After return, the product appears with "reserved quantity" in the stock summary

I have purchased and sold a product, but it was faulty and therefore returned. I have made return on the delivery note and a debit note to the customer. Then I made a return to the supplier - from the purchase receipt and the purchase invoice. Now in the Purchase Order list the product shows as To Receive and Bill and in the Stock Summary it appears as reserved quantity. So what can I do to fix this? Thanks in advance!