Port Code for Services

I have received an email every month with subject "non-transmission of invoices due to negative balance".
then I have checked on Portal and there is showing the reason as your Port code mismatched.

I have booked export invoice Table 3.1(b) for services without port code as there is no port code for services.

I want to know that what is the port code for Services under GST.

please guide me and help me out.

Thanks in advance
Replies (3)

There is no port code for services , kindly CHK the export service reported in GSTR 1. Is it reported in correct table of GSTR 1.

Yes Pankaj Ji, I have reported in correct table i.e. Table 3.1(b)

then why I got the email every month while filling GSTR-3B

please guide me
What about GSTR 1,..... kindly chk the table for GSTR1 ????

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