In a previous post we had a look at multiple invoices for multiple receipts on a purchase order. A variation on this might be that a supplier sends you one shipment but for some reason multiple invoices. This could happen for example when they perhaps had some stock and they got some other stock drop shipped from their supplier and it was consolidated from a freight company and set to you. There are many reasons why it might have happened. You can enter the multiple invoices in AX and match to the quantity of the PO that you are entering the invoice for.
Here is a quick walkthrough.