QuickBooks Online Sync Error: Invoice XXXX cannot be created in QuickBooks Online - Invalid Reference Id : Product/Service assigned to this transaction has been deleted. Before you can modify this transaction, you must restore XXXX (deleted)

Why the Sync Error occurs

This error occurs when an invoice is trying to sync to QuickBooks Online (QBO) from PayMaker, but a product or service on the invoice has been deleted in QBO.

How to Fix the Sync Error

Check QBO for all the products and services listed on the invoice and make sure they are active. If you are not able to find a deleted item, the link between QBO and PayMaker may be broken. Please contact Customer Support in that case.