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.
Legal Commentary & Landmark Judgments: Section 240
Section 240 mandates that 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 to recall or re-summon, and examine with reference to such alteration or addition, any witness who may have been examined (replacing Section 217 CrPC).
Linchpin trial right: The moment the trial judge alters the charge (e.g., from Section 115 BNS simple hurt to Section 117 BNS grievous hurt), immediately file an application under Section 240 BNSS demanding the recall of the doctor and key eyewitnesses for fresh cross-examination.