Nazeer Bhai
whether it is an E tkt or PRS tkt - copy of id card is must for change of boarding point. Reason behind this is not to identify the travelling people. i too can go 4 change of boarding point for your ticket by producing your id card. So establishing id is not important here.
They are asking this as a proof of changing of boarding point by a bonafide or genuine passenger. i too can have someone's PNR and fill up a requisition form for change of boarding where as...
more... original passenger does not want to change the boarding.
To avoid this type of situation, they want xerox of ID card of passenger for their records. b;coz getting PNR not so tough but getting Passenger id card is not easy...