Revenue stamp on demand promissory note

A revenue stamp shall be affixed by the borrower.

There is no hard and fast rule that the borrower has to sign only on the revenue stamp affixed in it, especially if there are more than one borrower, they can sign the promissory note one by one or in the order as they have decided, signing over the revenue stamp alone is not mandatory.

My query is only one (single) revenue stamp would suffice on demand promissory note even if there are multiple borrower/coborrower? OR we need to attach revenue stamp for each borrower seperately so there will be multiple revenue stamp on single promissory note?

Your query was ansered properly but without understanding the anser you are repeating the same question. 

When it is not at all mandatory to affix revenue stamp to the promissory note then where  is the legal  necesity  to affix revenue stamps by each borrower