How to pass the entry for goods who is damage by fire

Hi All,

I have purchase some goods for the customer , while due to some  power issuse the goods got damage due to fire, now i want to know how to adjust this goods value.

The situation is this I have made PO( Purchase Order) and GRN done only invoicing is left, because goods get damage , now i can't sale the good. so need to adjust the entry .

Regards,

Shailesh