What is the ruling when the contract pertains to a specifically described item in liability (Dhimma) rather than a specific known object (Ayn)?

Primary text

If the contract concerns an item described by specification in liability (Dhimma) and not a specific object, the contract is not rescinded upon finding the delivered item non-conforming. Instead, the lessor is obligated to substitute it with one that meets the description, analogous to a delivered item *muslam fih* delivered contrary to its stipulated quality.