(1) Where performance is to be made to the pledgee and the creditor jointly, they are reciprocally obliged to cooperate in the collection if the claim is due.
(2) Insofar as the pledgee is entitled to collect the claim without the cooperation of the creditor, the pledgee is to provide for collection in due form. The pledgee is to notify the creditor of the collection without undue delay, unless the notification is inadvisable.