If You mean drop shipments, where the supplier send the items directly to Your customer, and You want to know the cost of goods correctly for Your sales, then it is easy and all connected.
You have Sales Order and linked Purchase order.
On Purchase Order Post Receipt, and You can post Shipment on Sales Order, so that customer received the goods. You can also post Sales Invoice at this point.
When You receive invoice from supplier, post the Invoice from Purchase Order.
All the values, profits etc will be re-calculated by process "Adjust Exchange Rates", and "Adjust Cost- Item entries".
Hi, I'm sorry that I may not have fully understood your question, if the items have been posted receipts and shipment, it doesn't matter which one invoices first.
In addition, you can use the Adjust Exchange Rates batch job to adjust the final exchange rate, it is not necessary that the exchange rate on the invoice is exactly the same.
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