law: Code of Criminal Procedure Act, 1973
  
  217.Recall of witnesses when charge altered.-
  Whenever a charge is altered or added to by
  
  the Court after the commencement of the trial, the prosecutor and the accused
  
  shall be allowed -
  (a) to recall or re-summon, and examine with reference to such alteration or
  
  addition, any witness who may have been examined, unless the Court, for reasons
  
  to be recorded in writing, considers that the prosecutor or the accused, as the
  
  case may be, desires to recall or re-examine such witness for the purpose of
  
  vexation or delay or for defeating the ends of justice;
  (b) also to call any further witness whom the Court may think to be material.