Getting Error code=“001” for a Soap xml service in postman

Any idea on the error code=“001”? getting the below in postman for the API url and the request body I am sending. Is this something issue with the input requests to the web methods?

<ser:CommonResponse xmlns:ser=“”>
ser:returnString<?xml version=“1.0” encoding=“UTF-8”?>
<ShipNodes ErrorCode=“001”/></ser:returnString>

Can you please attach some screenshots from Postman with the request body, headers and the response body? Thanks!

Thanks for checking. Attached headers, request and response body snapshots.

Most SOAP API don’t react well to the Content-Type application/xml. Could you try text/xml just to make sure this is not the issue?

Also select XML instead of Text in the editor. This can help identify potential errros.