If you had not previously used lot or serial numbers, and you have on hand balances of items that you now want to track, follow this procedure.
- Use inventory adjustments to bring the balance of these items to zero.
- Edit each item and change the type to be Lot Numbered or Serialized as required.
- Receive the items to restore items back to the original and correct balance.
The above procedure will perform a journal entry for the 2 receipts but they will net to zero as long as the cost of the item does not change before doing the second receipt.