4.Waiver of right to object.—A party who knows that—
(a) any provision of this Part from which the parties may derogate, or
(b) any requirement under the arbitration agreement,
has not been complied with and yet proceeds with the arbitration without stating his objection to such
non-compliance withoutundue delay or, if a time limit is provided for stating that objection, within that
period of time, shall be deemed to have waived hisright to so object.