Editing receipts for 1st MTD

We are about to make our 1st MTD VAT submission and i have been transferring months worth of hand written ledgers on to sage. Edited a few bank receipts today using the steps from the transactions menu and ran a tax analysis report which seems to show original plus amended values in our daily till figures (they should have been lower) which is throwing our VAT figure out by a couple of thousand. Is there an error with the edit facility? Need to sort it asap as we are due to submit return.

Many thanks in advance!!