Hyundai Motor India — Payment for new purchase

Address:

Vadodara, Gujarat, 390010

I have just booked Hyundai a car for my father and when I went to make the payment the local store asked me to provide with a declaration that I am paying for my father and have no objection in making a payment. I queried this as I found this odd because I know no government regulation that requires me to do that. Aldíam Hyundai Makarpura Vadodara claims this is a requirement.
Not sure declaring this on a bit of paper has what relevance or is this a Hyundai requirement?

I recently bought another car 4 weeks ago for my family and also a byke for my brother I have never been asked to make such a declaration.