Problem
You tried to create a bill with a negative credit for Intacct, but the system blocked it due to a restriction on negative item quantities.
Solution
Apply negative credit on a bill for Intacct export
Created the PO with the item listed at a quantity of 1 and a value of $1.00.
Mark the PO as Sent, then mark it as Received.
Create the bill for the PO.
On the bill, manually adjust the Quantity Billed to -1.
Updated the Unit Cost to reflect the actual negative credit amount intended for export to Intacct.