List of Common Errors and their resolutions
Error Code - 2150
Resolution: Don't fire the same request simultaneously. This results in one request giving the error as 'Duplicate IRN request'. Best way to avoid firing of IRN request repeatedly for the same request, is update in your system with IRN number when the response comes back. Next time check the IRN, if it is not there, then fire for IRN.
Please go through this e-invoice_common_errors.xlsx for the resolutions.