GST for Dr Note to Parent Company

Mohanraj J (1166 Points)

04 December 2019  
Dear Friends,

We are providing Communication & Coordination services to our parent company's (situated in Japan) clients in India for selling their products. So, we are raising Dr Note for some percentage of annual sales as per agreement. In this case any GST impact?
Also, which reference rate shall we take? Either RBI reference rate or Group Companies Exchange rate?

Please guide me accordingly.

mohanraj_vkj @ yahoo.co.in