Invalid SML response HTTP Status code for SOAP Faults

When trying to create a new Service Group in an SMP, it calls ManageBusinessIdentifierService in the SML.
This currently uses SOAP 1.1 for this interface.
Now lets see the following request (to force a SOAP Fault, because of an invalid Participant ID):

---[HTTP request - https://acc.edelivery.tech.ec.europa.eu/edelivery-sml/manageparticipantidentifier]---
Accept: text/xml, multipart/related
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://busdox.org/serviceMetadata/ManageBusinessIdentifierService/1.0/ :createIn"
User-Agent: XML-WS Runtime 4.0.2 git-revision#0264419

<?xml version='1.0' encoding='UTF-8'?><S:Envelope xmlns:S=["http://schemas.xmlsoap.org/soap/envelope/"](http://schemas.xmlsoap.org/soap/envelope/)><S:Body><CreateParticipantIdentifier xmlns=["http://busdox.org/serviceMetadata/locator/1.0/"](http://busdox.org/serviceMetadata/locator/1.0/) xmlns:ns2=["http://busdox.org/transport/identifiers/1.0/"](http://busdox.org/transport/identifiers/1.0/)><ServiceMetadataPublisherID>HELGER2-SMP</ServiceMetadataPublisherID><ns2:ParticipantIdentifier scheme="iso6523-actorid-upis">test1234</ns2:ParticipantIdentifier></CreateParticipantIdentifier></S:Body></S:Envelope>
--------------------

Formatted:

<?xml version='1.0' encoding='UTF-8'?>
<S:Envelope xmlns:S=["http://schemas.xmlsoap.org/soap/envelope/"](http://schemas.xmlsoap.org/soap/envelope/)>
  <S:Body>
    <CreateParticipantIdentifier xmlns=["http://busdox.org/serviceMetadata/locator/1.0/"](http://busdox.org/serviceMetadata/locator/1.0/) xmlns:ns2=["http://busdox.org/transport/identifiers/1.0/"](http://busdox.org/transport/identifiers/1.0/)>
      <ServiceMetadataPublisherID>HELGER2-SMP</ServiceMetadataPublisherID>
      <ns2:ParticipantIdentifier scheme="iso6523-actorid-upis">test1234</ns2:ParticipantIdentifier>
    </CreateParticipantIdentifier>
  </S:Body>
</S:Envelope>

HTTP response returned:

---[HTTP response - https://acc.edelivery.tech.ec.europa.eu/edelivery-sml/manageparticipantidentifier - 400]---
null: HTTP/1.1 400 Bad Request
Connection: keep-alive
Content-Length: 562
Content-Type: text/xml; charset=UTF-8
Date: Tue, 16 Jan 2024 11:17:59 GMT
Server: Europa
Server-Timing: dtRpid;desc="1162590187", dtSInfo;desc="0"
Set-Cookie: JSESSIONID=xp4R_g_a1nHIDo_p5nGrjn9DN6RreB96fiICePrqfVw4i_XOW78p!1301775479; path=/; HttpOnly
Set-Cookie: dtCookie=v_4_srv_41_sn_D22A8364FD7636032D8649BEBF947978_perc_100000_ol_0_mul_1_app-3Aa59610c0788e5f57_1; Path=/; Domain=.europa.eu/edelivery-sml
X-OneAgent-JS-Injection: true

<soap:Envelope xmlns:soap=["http://schemas.xmlsoap.org/soap/envelope/"](http://schemas.xmlsoap.org/soap/envelope/)><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>[ERR-106] Identifier value test1234 is illegal. [xp4R_g_a1nHIDo_p5nGrjn9DN6RreB96fiICePrqfVw4i_XOW78p!1301775479!1705403879386]</faultstring><detail><BadRequestFault xmlns:ns2=["http://busdox.org/transport/identifiers/1.0/"](http://busdox.org/transport/identifiers/1.0/) xmlns=["http://busdox.org/serviceMetadata/locator/1.0/"](http://busdox.org/serviceMetadata/locator/1.0/)><FaultMessage>[ERR-106] Identifier value test1234 is illegal.</FaultMessage></BadRequestFault></detail></soap:Fault></soap:Body></soap:Envelope>
--------------------

Formatted:

<soap:Envelope xmlns:soap=["http://schemas.xmlsoap.org/soap/envelope/"](http://schemas.xmlsoap.org/soap/envelope/)>
  <soap:Body>
    <soap:Fault>
      <faultcode>soap:Server</faultcode>
      <faultstring>[ERR-106] Identifier value test1234 is illegal. [xp4R_g_a1nHIDo_p5nGrjn9DN6RreB96fiICePrqfVw4i_XOW78p!1301775479!1705403879386]</faultstring>
      <detail>
        <BadRequestFault xmlns:ns2=["http://busdox.org/transport/identifiers/1.0/"](http://busdox.org/transport/identifiers/1.0/) xmlns=["http://busdox.org/serviceMetadata/locator/1.0/"](http://busdox.org/serviceMetadata/locator/1.0/)>
          <FaultMessage>[ERR-106] Identifier value test1234 is illegal.</FaultMessage>
        </BadRequestFault>
      </detail>
    </soap:Fault>
  </soap:Body>
</soap:Envelope>

As expected a SOAP Fault but in combination with HTTP status code 400.

==> Based on the SOAP specification 1.1, SOAP faults MUST be returned with an HTTP status code 500: https://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383529

==> Only SOAP 1.2 specification allows the HTTP status codes 400 and 500 to be an error.

The SOAP version seems to be determined in the WSDL files by using the SOAP transport URI "http://schemas.xmlsoap.org/soap/http". By using "http://www.w3.org/2003/05/soap/bindings/HTTP/" it would be SOAP 1.2 instead.

Sent an emal to EC support. Lets see :)

phax / peppol-commons

Invalid SML response HTTP Status code for SOAP Faults #48