Sir I have given a sum of Rs 15 lacs to my friend as a loan. Amount credited to this Bank Account. He is paying interest on the amount every month and the interested is getting credited in my SB Account with SBI. I gave this amount on a promisory note. The note is affixed by a Rs 1 revenue stamp. Please confirm if the promisory note duly affixed by Rs 1 revenue stamp is challengable in the court and will it be accepted as a legal document.