hi, we have just noticed that most of our sales invoices dont include VAT when they should have as we are VAT registered. All of our VAT returns have been submitted, what can I do to go back and add VAT onto the sales invoices as the system wont let me edit any invoice, please help
You can either rollback those VAT returns, this will unlock any associated invoices or you can manually calculate any VAT owed and submit an adjustment on the next return.