Supporting a Foreign company in India from Dubai

Hi, I am currently employed with a Dubai based company,  we have a sister company in India and I am supporting them as well. 

I do not get salary from the Indian company as my package is all for Dubai.

Kindly advise on the following:

1. Do I have any tax liabilities in India

2. How far is my responsibility concerning the transactions I execute for India

3. Are the transactions I make be binding?

Thank you so much for your reply.