I invoice a customer for services. I also purchase a product from that customer that is not related to services that customer is billed for. They send me an invoice for that product. When the customer pays my invoice they deduct the amount for the product I purchased(the amount of this invoice I received from them). Example: Customer B invoice #10 $500 Vendor B Bill #A2 $300 when I receive check from Customer B it will be for $200 paying invoice #10 with bill #A2 already deducted How do I mark this invoice paid and mark the bill paid?
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