Invoice under counter cash sale

Deep Shah (Job) (169 Points)

14 April 2018  

Respected All,

Our business is retail business (new) started from 01st January 2018 (Expected Annual Turnover below 25 Lakhs). Our 90% sale is counter cash sale hence we have not raised invoice for the same. Only we have raised invoice who has GST Number.

Is it correct ? OR I need to prepare one single invoice of daily cash sale with different series like (DCS 01, DCS 02, etc) ?

Since in GSTR-1 there is column 13 : Documents Issued.  So I need help.