Why is my Purchase Order getting rejected by QuickBooks Online with the error "Business validation: you must select an account"?

Why is my Purchase Order getting rejected by QuickBooks Online with the error "Business validation: you must select an account"?

In QuickBooks Online Organisations you can hide a Category and if that's the case, it's not mandatory to state a Category in Purchase Orders. But sometimes QuickBooks Online rejects Purchase Orders with the error "Business validation: you must select an account":



The reason for this could be: you have not selected the "Expense account" for the Product you're using in QuickBooks Online, or the Product/Service has been updated during the approval process.
Please make sure you have specified the "Expense account" in the Product/Service in QuickBooks Online and try again to create the Purchase Order:



Please note: any changes in the QuickBooks Online Products and Services catalogue during the approval process in ApprovalMax may lead to such errors and the inability to create documents.