If you have allocated a payment or part of a payment to the wrong bill, you can deallocate the payment, and re-allocate to a another.
However, if you are on cash VAT accounting and have included the payment on a VAT return, you will be unable to use the deallocate feature. See the guide below to learn how to fix this issue:
Deallocating a payment also allows you to edit the bill and make any corrections before re-allocating.
However, if you are on an invoice VAT scheme and the bill has been included on a VAT return you will be unable to make any changes to the bill. See the guide below to learn how to fix this issue:
This guide details how to deallocate a payment from a bill.
Navigate to Purchases > Bills.
Next click on the payment ID for the bill you want to deallocate.
Once the bill is open, scroll to the bottom of the page and click deallocate under payment history.
Once this is done the payment has now been deallocated and the bill will appear as unpaid.
The deallocated payment will remain unallocated on the Money > Uncallocated cash menu. You can re-allocate it to a future bill from this menu or by heading back to Purchases > Bills > Unpaid and clicking on a Bill ID number and hitting the Allocate payment button.