Credit note raised by supllier

Mayank Khemka (74 Points)

20 June 2018  

My Supplier gave a cash discount credit note for supplied made to me. He also gave me  credit of IGST 12 % as thats what was charged in the invoice.

 

How do i treat this in GSTR return filing. MY lawyers says you have to mention it in GSTR3b since it is on purchase, but my question is which column ?