If there is a payment sitting on either a Sales Ledger Account or Purchase Ledger Account that isn't required - for example, the payment was accidentally processed twice, you can reverse these by doing the following :
Sales Ledger
Post a Sales Ledger Invoice for the opposite amount of the figure that you are wanting to reverse.
The system will automatically calculate the VAT - zero the VAT calculation, no VAT is required.
Select the required nominal code - so if it went to the cash book, then you would enter nominal code 0.0.60.6.
Post the invoice.
Go into post Receipts - search for the required account, don't enter a payment amount and then double click the invoice you just created. This will match against the unallocated payment. Click Post to process the payment.
Purchase Ledger
Post a Purchase Ledger Invoice for the opposite amount of the figure that you are wanting to reverse.
The system will automatically calculate the VAT - zero the VAT calculation, no VAT is required.
Select the required nominal code - so if it went to the cash book, then you would enter nominal code 0.0.60.6.
Post the invoice.
Go into post Payment - search for the required account and on the transactions that display double click the invoice you just created. This will match against the unallocated payment. Click Confirm to process the payment.
The invoice and payment will clear off the account overnight.
Users should not reverse any batch via the nominal that has been posted to the sales or purchase ledger as this will create an imbalance in the reconcile.