Possessing the Commodity and its Substitute of an Invalid Transaction
Issue No. 2191- If an invalid transaction takes place, for example, a commodity that should be purchased and sold by weight is sold without being weighed, neither the purchaser becomes the owner of the commodity, nor will the seller become the owner of the money. However, there is no harm in making use of their own property if both the seller and the buyer consent it regardless of the transaction, otherwise the things taken by them from each other are like usurped property and should be returned back to the respective original owners. And if the property of each of them perishes while in the custody of the other, he should pay compensation for it regardless of whether or not he knows that the transaction was void.
