Keep three inquiries separate:
Existence — Is the fruit being sold already there and identified?
Conditions — Does the sale require it to stay attached until later?
Determination — Is the sold remainder clear when a portion is reserved?
Quduri allows the sale of existing fruit in either stage of suitability and states an immediate cutting obligation. A contractual retention condition makes the sale defective. Reserving specified weight from unsorted fruit still on the tree is prohibited in his text.
Do not confuse these with future nonexistent crops, subsequent permission or already separated weighed produce.