public void ASTInvoiceUpdateTestUsingoAuth(ServiceContext qboContextoAuth)
{
//Creating the Invoice for Adding
Invoice invoice = QBOHelper.CreateASTInvoice(qboContextoAuth);
//Adding the Invoice
Invoice added = Helper.Add <Invoice>(qboContextoAuth, invoice);
//Change the data of added entity
Invoice changed = QBOHelper.UpdateASTInvoice(qboContextoAuth, added); //To override AST invoice tax using TotalTax
//Update the returned entity data
Invoice updated = Helper.Update <Invoice>(qboContextoAuth, changed); //Verify the updated Invoice
}