A client recently started using a new third party app to create invoices. The app created a new VAT code in the system that while going to the correct liability account (VAT control) didn't have the relevant information needed to pull into VAT reports (and the VAT return itself). While we've managed to get it dealt with now, QBO shouldn't be allowing things like incomplete VAT codes to be imported into the system, as things like this can cause havoc on a file, not to mention severely damage confidence in the ability of the software to report correct data.