I missed 2 duplicated purchase transactions that the active feed has imported. Unfortunately it was 16th March so submitted in that VAT return.
Is there anything I can do to adjust this somehow so that the bank balances match and also qualifying the VAT for the next return? Some sort of credit raised?
The quickest and easiest way to resolve this would be to raise a credit note for the duplicate invoice. If you mark it as a refund, this will also create the bank transaction for you too.