Can revised return be denied under certain circumstances?

Does Income Tax dept allow submission of revised return always? Or can it reject a revised return on certain ground? I am salaried, and I did not disclose deduction due to house rent paid to my employer and this was not reflected in form 16. Also I   did not take it in account while submitting e-return ITR-1 on 31st july and later sumitted another revised return on 31st August, 2012 both on the due dates (followed by ITR-V). (The second return I submitted already shows some small of refund, Rs85 or so to be paid to me by income tax dept.) I was not sure whether I would go for house rent deduction since the amount was not much. Now can I submit another revised return ITR-1 (2nd time) claiming house rent deduction? Is that allowed? Actually this delay is my fault. Pleae suggest.