AP Enter Vendor Prepaid allow for prepay of ITEM ID instead of simply CATEGORIES and allow it to be brought up when receiving PO Invoices

When entering a vendor prepaid, allow it to prepay for a specific Item ID instead of just Categories. Further, have the AP side of the system function like the AR side of the sytem (when a customer orders an Item they have prepaid for, the system by default reminds you to apply the prepay and the prepay price to the order). The AP side needs to do the same and when a PO is receoved or invoiced it needs to have the user apply the prepay at the prepay price. Or you could tie the Prepay to a PO number too instead of just an Item ID. Prepay for a specific PO and once that PO is received have it tied to and applied from the vendor prepaid so the user doesn't have to remember to do it themselves.