I've got the following scenario:

• I create a PO with qty 1000 of Item A on it.
• I receive against the PO at two different times, so I make two Receipts of Goods against said PO.
  • The first receipt I receive 500 of Item A, and add a charge to the receipt, Item B, with a qty of 500 and an extension of $25.00. It calculates the unit cost out at $0.05.
  • The second receipt I receive 500 of Item A, and add a charge to the receipt, Item B, with a qty of 500 and an extension of $50.00. It calculates the unit cost out at $0.10.

My issue comes when I go to create a Receipt of Invoice for one of the loads. I end up with three lines, one from the PO for Item A, and two for Item B. As a human, it's fairly easy for me to look at the first line for item B and see that the quantity and calculated unit cost match the first Receipt of Goods I entered. I therefore know to invoice the 500 of Item B @ $0.05. But let's say I didn't. Is there any way to tie back a line on a Receipt of Invoice to the Receipt of Goods that created it?