Could you make custom field to be select-able to be shown as column for journal entries too? My reason is we are providing several services and we have different service types. Whenever we receive a sale, we have a certain service type for it. We wanna analyse the revenues based on each service type each month; so it would be a great help if we can have a custom field that is shown as column.
Why not have multiple income accounts, each for different type of service? That way you can see break-down on your profit & loss statement.