Co-operative society need to file it return

yes.If we read sec. 139(3) and 139(1), section 139(3) states that if an assesse has loss under PGBP or Cap. gain , then assesesee may furnish the return within the time precribed under section 139(1) .i.e. on or before due date.What sec .139(3) is indicating that the loss return should be filed within the time mentioned in sec. 139(1) , not the whole section 139(1),even if assesse is not chargeable to income tax.