PO Amount negative

Hi,

I have an issue with a PO where we had to replace a part that was out of stock with a different part. The order total won’t take into account the change in Price between the old part we removed from the PO and the new part that replaced it.
If I erase all my lines from the PO that difference in Price between the old and the new part still shows up in Order Total(see below). How can I remove this negative amount ?

I’ve seen this on Orders.

If you’ve gone to point of deleting all the lines, might as well void the PO and start with a new one.