Filing of income tax return by co-operatives societies

Hi friends, As per Sec.139 every person whose total income exceeds the exempted limit is bound to file return. Total income is to be computed without effecting exemption as per Chapter VIA. In the case of Co-operative societies "total income" is to be computed after deduction under sec.80(P). Is not this a contradiction. Unlike Individuals, AOP and BOI which has an  exemption limit of Rs.1,80000- (2012-13) no such limit was prescribed for co-operatives societies. As a result all co-operative societies are to file IT return  as per sec.139 even if there is a total income of Re.1-  without affecting deductions.. Am I not correct.