Serialization implementation - Sage 300 v2017 I/C (Help!)

SOLVED

We just started using serialization and we have a few items in inventory (received before the item had the serial number flag turned on) that we wanted to record serial numbers for when we shipped. So I went into Serial / Lot Reconciliation and added serial number receipts for them so the serial numbers would be available.

One of the items had not yet had the PO invoice applied against the receipt, and when we try to post the PO invoice now, we get "Serial/lot's quantity does not match the transaction quantity for item" and are unable to post the invoice (or do anything).

I don't want to turn on the “Allow Serial Quantity to be Different from the Quantity in the Entries” flag for this item - any ideas on how to fix this?

Sage 300 v2017