What steps should I take if the e-invoice feature is not working correctly in BUSY?

Follow below steps if the e-invoice feature is not working correctly in BUSY:
 Step 1: Check your BUSY model as e invoice can be generate in Standard/Saffron/Enterprises/Emerald model only.
 Step 2: Check your BUSY License Subscription is activated or not. 
 Step 3: Update your BUSY with latest release.
 Step 4: Go in adminstration and select configuration.
 Step 5: Then select features/options.
 Step 6: Click on GST/VAT.
 Step 7: Check in E invoice configuration window station and pincode has been defined or not.
 Step 8: Then click on GSP configuration and validate it.
 Step 9: If not validate then again create another GSP ID through Eway bill portal.
 Step 10: Go in transaction and generate invoice.
 Step 11: Validate party GSTN and click on update back and quit save it.
 Step 12: Go in item master, press ALT+M in tax category check relevant type belongs to your HSN code as goods/service.
 Step 13: Check billing/shipping details.
 Step 14: Mention station and pincode in transport window.
 Step 15: Before generation check errors in transaction.
 Step 16: Also you need to check the firewall settings and exclude BUSY from anti virus.
 Step 17: Check E invoice portal working or not.