(2)Such proposals shall be taken into consideration by the Panchayat, only at the instance of the Executive Authority or the Commissioner or the [Secretary] [Substituted for the words 'Chief Executive Officer' by Tamil Nadu Panchayats (Third Amendment) Act, 1998 (Tamil Nadu Act 28 of 1998).], as the case may be, and the Panchayat may sanction the proposal with or without modifications:Provided that no proposal adversely affecting any officer or servant of a Panchayat who has been in the permanent service of such Panchayat for more than five years and is drawing a salary of not less than five hundred rupees per mensem shall be considered except at a special meeting convened for the purpose and no such proposal shall be given effect to unless assented to by at least one-half of the members then in the Panchayat.