If you are encountering an error when syncing a Printavo Invoice to QuickBooks that states:
Business Validation Error: Were sorry, QuickBooks encountered an error while calculating tax. Try reselecting the tax rate or reentering the product/service item and saving the form again.
and are located in Canada, we have a solution for you. Because of tax restrictions in Canada, and if the order has a sales tax greater than 0%, all line items must be marked as taxed: