If you are unable to generate E-Invoice, you can check the following Errors:
Step 1. Verify that the location, pincode, and address in the party master are correctly mentioned.
Step 2. Ensure that the GSTIN number is correct and validated.
Step 3. If the HSN code belongs to a service, select the tag category as Service GST Rate in the item master.
Step 4. The HSN code should be numeric and compliant with the Aggregate Annual Turnover.
Step 5. Sales voucher numbers cannot start with zero.
Step 6. Sales voucher numbers cannot exceed 16 characters.
Step 7. Always ensure that UQC (Unit Quantity Code) is mentioned in the unit master.
Step 8. In the transport window, specify the location, Pincode.
Step 9. If the invoice is bill to ship to, check the details in the billing and shipping window.
Step 10. Also, validate GSP ID. To do this, go to Administration, Configurations, then Features & Options, and finally, GST/VAT.
Step 11. Then Click on GSP configurations and Validate.