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The assignment of a claim (including the assignment of a claim that is yet to arise) may not be duly asserted against the applicable obligor or any other third party, unless the assignor gives notice of this to the obligor or the obligor has consented to the same.
債権の譲渡（現に発生していない債権の譲渡を含む。）は、譲渡人が債務者に通知をし、又は債務者が承諾をしなければ、債務者その他の第三者に対抗することができない。
Notice or consent referred to in the preceding paragraph may not be duly asserted against a third party other than the obligor unless the notice or the consent is made using an instrument bearing a certified date.
前項の通知又は承諾は、確定日付のある証書によってしなければ、債務者以外の第三者に対抗することができない。
This names a provision as it read when this amending Act was made. It may have been amended since, so today's text can say something else. That is why it is not a link.This names a law that is not in this collection, so there is nothing here to open.We could not tell which provision this names, so it is not a link.