One of our vendors will often send us purchase in separate deliveries. Then, they will invoice us once, essentially tying two item receipts to one invoice. Our workaround, since I do not see any real way to solve this, was to delete one item receipt and receive the items on the other item receipt, therefore merging the item receipts. 

The problem is, and you can see it in the attached image, that the item receipt window will forget that re-received item is tied to a PO, and the PO window will show the item still not received, though you can clearly see it is on the Item Receipt. 

Is there a fix for this or a better way to go about it?

Thanks