Description:
On the xero_error property of an order or invoice, the following error is displayed and the invoice may not be synced to Xero:
A validation exception occurred, The TaxType code 'INPUT' cannot be used with account code '<account code>'
Reason:
This error will be received when the freight account in Xero is set to a revenue account. Ordermentum only allows freight to be an expense.
Resolution:
Make sure the freight account in Xero is an expense account and not a revenue account.