The timely filing of an appeal shall extend the time for any other party to cross-appeal as set forth in Pa.R.A.P. 903(b) (cross-appeals), 1113(b) (cross-petitions for allowance of appeal), and 1512(a)(2) (cross-petitions for review). The discontinuance of an appeal by a party shall not affect the right of appeal or cross-appeal of any other party regardless of whether the parties are adverse.
210 Pa. Code r. 511