Re-submission of document allowed when suit transferred

Once submitted (Bahi-Khatavni - daily transaction entries) document in civil suit by plaintiff and his cross-examination started, in between the suit transferred to lower court, the plaintiff died, his legal heirs collected the same document from court Clark of upper court in self custody without any application or court orders and again submitting in the same suit in lower court. Is this allowed? Should lower court grant re-submission of same documents which was not transferred with the court procedure to lower court? What is the defense of defendant to not allow submission? As the plaintiff may have done changes in the Bahi-khatavni as per the WS filed by defendant? Any case laws to oppose?