How to pay advance for destination type inventory ?

Dears,

We are encountering an issue that we have a inventory items shipment, we need to pay 50% (as prepayment) for the supplier before receiving any of the items.

As we were trying to do it as complex PO an error occurred: "This line has a destination type of Inventory or Shop Floor and cannot be added to a document with a Style that allows progress payments."

After some searches we found that this functionality does not work in 12.1.3 (Doc ID 1665467.1 and Doc ID 1674120.1).

Can someone advise how can we achieve to pay the 50% of the shipment with destination type inventory ? (If the solution is a prepayment we need to keep it linked to the PO and not create a prepayment that is not linked to any PO).