Services carried out for one client required a lot of travelling, which I added as rechargeable expenses to the invoice and sent all the ticket confirmations etc. But for one journey, I mistakenly created a rechargeable expense leaving off the £3.60 booking fee. As it is such a small sum, I’m happy to write this off as a bad debt, rather than pursuing the client for it. However, I can’t reconcile the sum I paid for this travel expense because of the amount recharged. How can this be fixed?