Certain doubt with regard GPA transactions

sir. My brother is in London. He has a property in India and would like to sale the same and he does not have any bank account in India. Now he says he will give the GPA to do this sale transaction and after I do this transaction I should take that sale proceeds in to my bank account and then I have to transfer to his overseas account. Is it correct or How can I go ahead about it, and I should not be troubled because of this entry from the Income Tax Department. Kindly enlighten me.