@Shan if the order quantity is not known before hand, you can create empty purchase order and allocate all goods receipts to this order. This will give you negative qty to receive.
Once you reconcile with your supplier the quantity received, you can update the purchase order with the quantity. Now Qty to receive will be zero.
Start new purchase order for the next batch of deliveries.
Yes. Sounds simple. I agree. But I don’t think it’s this “clean”. Sure there is a delay between you agreeing on quantities and supplier actually issuing the invoice. In the meantime there could be new deliveries. So the quantity to deliver would not come to zero because of the timing.
Even though purchase order method is a few more clicks per week, it does allow you to split all deliveries into separate chunks (e.g. weekly chunks) that are individually reconciled to zero.
And if there is a disagreement with supplier over quantities, it’s limited to single purchase order that covers one week. It doesn’t spill over to subsequent periods.