supply to SEZs

Arulmozhi Subramaniam (104 Points)

09 February 2018  
Sir
one of my client wants to supply material to local SEZs.party gave certificate of SEZs valid from 2015 -2021which was before GST but the letter date is Dec 2017. Party asked materials for zerorated ,i want to know how to raise the bill.this is new for me plz guide me....