Deducted from receipts

I have a client who is also a supplier.
In essence how they work is that they manufacture, sell and distribute goods for me and therefore they invoice me an amount. But they also collect monies in for me for the sale of those goods. Therefore any invoices they raise for me are to be deducted from receipts.
How can quick file link these sales and purchase invoices together?
Thank you.

http://community.quickfile.co.uk/t/contra-invoicing-same-customer-and-supplier-netting-off-receivables-and-payables/345/2

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Thanks so much Joe,
This is very helpful and I appreciate your response.