ولا يجوز السلم حتى يكون المسلم فيه موجودا من حين العقد إلى حين المحل
Translation: Salam is not permitted unless the stipulated goods are available from the contract until the delivery time.
A central Quduri condition is that the type of goods owed remain available from formation of the contract until maturity. This does not demand the seller already own all goods on day one; rather, the class of goods must be obtainable without depending upon a purely accidental crop outcome.
Example: a commodity entirely absent from the market for a large part of the agreed period raises the classical difficulty of interruption in supply. The concern is availability of the stipulated genus, not an arbitrary seasonal label.