Istana‘

'Istisna‘' is the second kind of sale where a commodity is transacted before it comes into existence. It means to order a manufacturer to manufacture a specific commodity for the purchaser. If the manufacturer undertakes to manufacture the goods for him with material from the manufacturer, the transaction of istisna‘ comes into existence. But it is necessary for the validity of istisna‘ that the price is fixed with the consent of the parties and that necessary specification of the commodity (intended to be manufactured) is fully settled between them.

The contract of istisna‘ creates a moral obligation on the manufacturer to manufacture the goods, but before he starts the work, any one of the parties may cancel the contract after giving a notice to the other 1. However after the manufacturer has started the work, the contract cannot be cancelled unilaterally.