The acknowledgement of a debt may assume two forms under the Negotiable Instruments Act namely 1. Bill of Exchange and 2. Promissory Note.But ;considering X as the lender of money to his wife Y, X gets the P.note or Bill of Exchange from Y , the wife. While X has a proof of debt , Y has no similar document from X . X need not sign any document in acknowledgement of getting the instrument signed by Y. So, what is the defence of Y that she already signed a proper instrument evidencing the debt in case the execution of document is challenged by X?