Sage Intacct Error: Bill XXX cannot be created in Bill.com - Purchase Order quantity billed out of bounds

Why the Sync Error occurs

This error occurs when you link a vendor invoice to a PO in Sage Intacct, and that vendor invoice tries to sync as a bill to Key CashFlow, but a line item(s) amount on the bill does not match the line item(s) amount on the PO in Key CashFlow.

How to Fix the Sync Error

Edit the PO or the vendor invoice in Sage Intacct so all lines on the vendor invoice have the same amounts as the lines on the PO, and sync again.