Never mind if you use Warehouse Receipts or Purchase Receipts, everytime when you post Warehouse Receipt, system make Purchase Receipt (number of them depends of PO number). In situation you have one Warehouse Receipt based on two Purchase Orders, system created two Purchase Receipts.
If you want to find your original Warehouse Receipt, you need to press Navigate from Posted Purchase Receipt.
You will find 'Posted Whse. Receipt Line' on Navigate pane. Open it and you will find original 'Posted Whse. Receipt'.
NAV must to create standard Posted Purchase Receipts from system rasons.
