QuickBooks Error: Business Validation Error has occurred while processing your request

Applies to: ConnectWise Manage and QuickBooks Online

Error

A business validation error has occurred while processing your request of type: Invoice  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.

How can this happen?

If you have AST enabled when an invoice is synced Quickbooks Online needs to be able to validate the shipping address to calculate AST correctly. If a shipping address entered on the invoice is invalid or if the postcode is missing, Quickbooks Online AST will not be able to calculate the tax rate resulting in a validation error.

Solution

Update the address you are shipping to in ConnectWise Manage ensuring that the postcode is present, then resync.

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