If you're receiving this error when syncing an invoice/receipt, you can fix the problem by modifying some setting in QuickBooks.
Invalid bundle entry in SalesItemLineDetail: Invalid bundle id X passed to SalesItemLineDetail.ItemRef. Please use GroupLineDetail with bundles.
This error will occur when a Service is created in QuickBooks as a Product/Service, then is manually changed to a Bundle in QuickBooks.
To correct this issue:
Login to QuickBooks
Locate the Products/Services page
Change the Product in question from a Bundle to a Service. You may need to re-create it as a Service.
If you recreate the service in QuickBooks you may need to update the service code in KennelBooker.
See our main QuickBooks integration article on settings up service/product codes.