Dispute in raising Invoice

ANKIT RISHI (109 Points)

14 July 2017  
My client is of Delhi and has GST no of the same..we are supplying services to them in kolkata..as we are registered in WB shall we raise invoice applying CGST and SGST or shall apply IGST??
Problem is if we apply CGST n SGST then they will not get the credit of it. Please guide us on this issue.