(1) If more than one person has contributed to an outcome for which the reward is promised, then the person promising the reward is to apportion the reward at their reasonably exercised discretion, taking into account the contribution of each one to the outcome. The apportionment is not binding if it is manifestly inequitable; in such a case the matter is decided by court decision.
(2) If the apportionment by the person promising the reward is not recognised as binding by one of those concerned, then the person promising the reward is entitled to refuse fulfilment until those concerned have settled the dispute on their entitlement among themselves; each of them may demand that the reward be deposited for all of them.
(3) The provision of section 659 (2) sentence 2 applies.