I invoice my contractors for fixed fees, for example monthly software licence fees and consulting fees. This is an indemnified cost, which means I am billed by the supplier and pay the supplier, then I invoice my contractors. I don’t think this should be categorised as General Sales, but do not know where it should be posted?
If you don’t think it fits into one of the nominal codes already available then you can create your own more specific one. There is a guide on how to do this here: