I would like bank transaction lines to have the ability to be linked to both a sales document and a cost document.

For example, I may issue a sales invoice for the gross sales amount, but the payment received in the bank is the net amount after a third party deducts their commission fee.

Example:

Sales Invoice: £100.00
Commission Fee (Cost): £10.00
Bank Receipt: £90.00

When matching the bank transaction, I would like to:

Select the gross sales invoice (£100.00).
Select the commission fee expense (£10.00).
Have the system recognise that these documents reconcile to the £90.00 actually received in the bank.