All experts,
You can create a purchase order, create down-payment without reference to purchase order.
Make delivery and when you raise the supplier invoice, you can add the down-payment request to this supplier invoice resulting reduction of the downpayment value from total invoice value.
- First Question, Why Down payment of supplier in ByD has order ID?
The usual business process is you raise PO and before supplier can delivery he would ask for downpayment before he can make delivery.
Hence to make a reference you have PO ID but kindly note that this is optional
- Second question, Can Down Payment of Byd be assign for line item of PO?
No you cannot link the line item of PO at line item level of PO as this happens at header as you can attached screenshot.
Regards
Leo