An added condition is not automatically unlawful merely because it appears in a sale contract. Classical Hanafi commentary asks:
1. Is it required by the sale itself, such as payment or delivery?
2. Does it validly secure an existing right?
3. Is it authorized by law or accepted commercial custom?
4. Does it impose an impermissible, independent benefit on a party?
This is a structured test, not a rule that all extra terms invalidate sales.
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Invalid and Defective Sales: Conditions, Possession and Remedies
An added condition is not automatically unlawful merely because it appears in a sale contract. Classical Hanafi commentary asks:
1. Is it required by the sale itself, such as payment or delivery?
2. Does it validly secure an existing right?
3. Is it authorized by law or accepted commercial custom?
4. Does it impose an impermissible, independent benefit on a party?
This is a structured test, not a rule that all extra terms invalidate sales.