QuickBooks Online Sync Error: Missing required data for: quantity.
Why the Sync Error occurs
This error occurs when you are attempting to create Accounts Receivable invoices in QuickBooks Online (QBO), but Inventory is not enabled. Inventory is required to record quantities on invoices in QBO.
How to Fix the Sync Error
- In QBO, enable Inventory
- Contact Intuit's QuickBooks Online Support for additional assistance