Normally, Any document which requires stamp duty, is first stamped by way of franking, and then signed/executed.
I have a query that i had an agreement which was formed by two parties. Due to mistake, one of the party signed the document before it could be franked for stamp duty. The document got franked thereafter, even through it was signed by one person. The other person signed that document after franking.
Whether such document remains valied or it needs to be corrected