How is a disagreement resolved if the parties differ on the specific trees covered by the sharecropping agreement?

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The default position dictates that if the parties disagree on the subject matter of the Musāqāh (the trees), the matter is resolved by mutual oaths (tahāluf) according to Imam Al-Shafi'i, or by the statement of the capital owner prevailing based on the principle that the claimant must provide proof, supported by the prophetic tradition: 'The evidence is upon the claimant, and the oath is upon the one against whom the claim is made.'