Invoice

Dear Ravi

 You mean the invoice includes both taxable and exempted goods/services. Right?

In such a case, both the values to be entered in GSTR 1. Taxable value to be given for each tax rate category totaling the invoice value. (i.e. along with gst)

Hope you are clarified.  

Dear Ravi

Gst is payable on the difference between RBI Rate and the actual rate. I give an example for better clarification

Suppose a Foreign Exchanger sells  100 US $ at the rate of 1 US $ = Rs.75 where the RBI Reference rate is Rs.74.

Then, Gst is payable @ 18% on the following value;

  (75-74)*100 = 100

So, Taxable value is Rs.100 and the Invoice value is Rs.118/- (inclusive of gst)