Your eVanik OWS has prebuilt GSTR-1 Reports.
Login to your OWS Account, and follow the steps below:
1. Click on the Menu Button and scroll down to the "Accounting & Finance" Section. Click on "Reports" Menu
2. Select the Menu "GSTR1"
3. Select the Date Range for which you need to download the GSTR-1 Report in the first filter
4. Click on "GSTR-1 Report"