If your own flat is self occupied,you can claim HRA is you are actually receiving it from your emplyer and paying rent.However,if your self occupied house is in same city where you are residing,there may be problem for you to prove that there is a business or emplyment constraint for your not living in your own house.In that case,the self occupied house might be treated as deemed to be on rent and you may have to pay tax on fair rent.Otherwise there is no problem.Under Sec 10(13A),read with rule 2B there is nothing against your claiming HRA exemption provided you satisfy the conditions stated therein.