Dear I.achayan:
Please go to the QCB website and open the Instructions to Banks and read the following on page 153 of the 12th edition of these Instructions to Banks issued by QCB:

"Customers and Guarantors should never sign any blank sheets of contracts, documents, cheques, receivable notes or guarantee applications. All blank spaces should be filled in with the required information . in case of any violation a financial fine shall be imposed....."

Take care...