Section 100(4) in Andhra Pradesh Municipal Corporations (Conduct of Election of Members, Election Expenses and Election Petitions) Rules, 2005
(4)Any candidate not already a respondent shall upon application made to the tribunal within fourteen days from the commencement of the trial and subject to the provisions of rule 106 be entitled to be joined as respondent.Explanation. - For the purpose of this sub-rule and of rule 99 the trial of petition shall be deemed to commence on the date fixed for the respondents to appear, before the Tribunal and answer the claim or claims made in the petition.