Reportedly, the message claims, "When you reach polling booth and if you find that name is not in the voter list, just show your Aadhar card or voter ID and ask for 'challenge vote' under section 49A and cast your vote."
https://www.timesnownews.com/mirror-now/in-focus/article/it-s-fake-whatsapp-forward-doing-rounds-spreading-wrong-info-about-voting-process-ahead-of-the-lok-sabha-2019-elections/394889