Recording a Negative Purchasing Invoice without Affecting The Quantity

I have received a negative invoice from our supplier for the price difference of a material. Initially they had charged us for a higher price for 30 pcs and now I have to deduct this amount from the material. Any suggestion about how I can record this negative invoice? I tried to enter the invoice as it is but Sage deducted the quantity as well by 30 pcs.

Thanks a lot in advance.

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