IF you are enbale e invoice and e way bill for a sales return,you need to follow given steps:
Step 1:Go to Administration menu,
Step 2:select Configuration,
Step 3:select Features and option,
Step 4:click GST/VAT Tab,
Step 5:Enable E-invoice Required
Step 6:Click configuration and mention location and pincode and save.
Step 7:Then click GSP configuration and Please paste the GSP credentials here that you created from your portal, then save.
Step 8:Go to the Administration menu,
Step 9:Click on Configuration,
Step 10:Click Voucher series Configuration,
Step 11:Click sales Return and select series,
Step 12:Click voucher configuration,Here you can enbale Generate E invoice and E way Bill After Saving,specify Y,save this window.