Correcting unsubmitted obligations
You can use the MTD Transactions Reset utility to erase the VAT stamps, so that errors can be corrected after you complete the calculation phase but before the transactions are submitted to the tax authority.
VAT stamps are the values for the VAT Period Key and the VAT boxes that are stamped on the transactions included in the calculation of VAT returns for an obligation.
Only unsubmitted transactions can be reset. Resetting stamps for a transaction is irreversible.
You can now perform the calculation process again.