Bill/Invoice number is being used on another bill from the same vendor. Use a unique invoice number for the vendor bill.
This error occurs when the bill/invoice number is already in use in QuickBooks Online (QBO) for that vendor or customer. This can also occur if the bill/invoice link between Bill.com and QBO is broken if the sync error is an update.
- If the bill/invoice is erroring while trying to create in QBO, use an alternate bill/invoice number
- If the bill/invoice is erroring while trying to update in QBO, or if it already exists in QBO and just needs to be linked to the one in Bill.com, click edit on the bill/invoice in QBO, then save, and sync again to prompt an update.
If the error persists after attempting the solutions, please contact Customer Support for assistance.