Vendor Managed Inventory

I have been running through the vendor managed inventory process on our system and everything has gone well up to the point where I have to generate some method of paying the supplier for the stock we have now receipted.

I can see items on the Received not Invoiced Report and I have new receipts with the packing slip of “SMI_1” against the correct SMI purchase order but how do I generate a payment?

Is there a report I need to run to send to supplier to tell them to invoice us for these goods, or is there a way of just paying a “self” generated invoice.