We have 2 receipts and from 2 invoices, for the same product, 2 different dates. We don't have any shipment.
Costing method FIFO, Costing Level: Client
Receipt Matching on Invoice
The posting is done for both receipts at the same price (they should be different as the price per invoice is different).
The posting mechasim is looking at the current cost and not on the cost details to determine the correct price.