Those will be returns or scraps on the purchase order receipt, triggering negative quantity (and therefore negative value) lines available to match with a credit note.

I suspect that if you look at the purchase transaction history, you’ll see the positive and negative receipt transactions.

@Ieva Rituma Thank you very much.

Additionally. If the Qty Invoiced was modified above what is available in GR. Difference will show up negative in your “Received not yet invoiced” logs.