It is not possible to amend a transaction once tagged.  Instead, you must post an opposite entry to the original transaction to either cancel or correct the original entry. For example, if a purchase invoice is entered twice in error and the VAT is subsequently included in the VAT return twice.  In the next VAT period, a reversal of the duplicate purchase entry can be made to return the VAT element to revenue and cancel the duplicate purchase entry.

To reverse the second instance of the Purchase Invoice Entry

1. Reference - This is the internal reference that will cross-reference the original physical invoice received from the Supplier which has been double-counted.
2. Date - Date of original Purchase Invoice.
3. Supplier - Select the Supplier name from the list of Suppliers (F2) to which the original purchase related to that you are reversing.
4. Narrative - The Narrative field is an optional entry which may be used to give an extra explanation or identify further the purpose of the reverse entry. It would be advisable to use this field to reference the original batch entry purchase transaction that you are reversing.
5. Nominal Account - Select the same original purchase/expense account to which the original purchase invoice was posted.
6. F5 - The F5 function key will display a historical breakdown of the transactions on the Supplier account (N.B. excluding any transactions within the current live batch as such entries have not been posted).  This will help identify the original purchases/expense account to which the original purchase was posted which should be selected for this transaction entry.
7. Amount - Enter the Gross amount (bottom line figure inclusive of VAT) as a MINUS figure.
8. VAT Rate - The VAT rate is automatically linked to the appropriate purchase account used, e.g. if you choose Purchases at a low rate then a VAT rate of 13.5% will automatically be linked to the purchase.  If you require a different VAT rate to be applied to the transaction entry, then simply arrow through the VAT rates shown. Simply stop on the appropriate VAT rate and this will apply to the transaction.
9. Post Entries - Select Post Entries to process the transactions once the batch is complete.

In the subsequent VAT return, the VAT element will be included for return to revenue to cancel the previous double counting and overclaim. The same principles apply to all reverse entries, simply return to the original transaction entry screen and enter a credit note or minus entry.