Record customer who is also a service supplier
We have a customer who we provide with products and invoice them.
On occasion they provide a service, which they invoice us for.
If they have an outstanding invoice payable to us, they deduct this from what they owe.
E.g. We invoice £1000 We use service to value of £400. They pay us remaining £600.
How do we correctly record this as a separate customer and supplier account would show the invoice they owe us as open.
