Assignment with presentation of documents

If the obligor has issued a document relating to the debt then, if the claim is assigned and the document is presented at the same time, the obligor may not, in relation to the new obligee, invoke the fact that the entering into or acknowledgement of the obligation is occurring only for the sake of appearance or that the assignment is excluded by agreement with the original obligee, unless the new obligee was aware of the circumstances at the assignment or ought to have known of them.