Adding custom Security tag to SOAP header in standard Call Web Service

Hello,

We have a new requirement on our project and we now need to add a specific security tag in our header . I have provided the expected content below without confidential information :

<soapenv:Header><wsse:Security xmlns:wsse="">docs.oasis-open.org/.../oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="">docs.oasis-open.org/.../oasis-200401-wss-wssecurity-utility-1.0.xsd"><saml2:Assertion ID=".." IssueInstant="2019-04-30T12:56:13.185Z" Version="2.0" xsi:type="saml2:AssertionType" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsd="">www.w3.org/.../XMLSchema" xmlns:xsi="">www.w3.org/.../XMLSchema-instance">...............
</saml2:Assertion></wsse:Security></soapenv:Header>

We can used the advanced call web service plugin but we want to use the standard to keep the automatic translation of the XML response into CDT.

We looked at community.appian.com/.../advanced-soap-web-service-configuration but we are not quite sure that the security policy will support the SAML2 assertion.

Has anyone met this issue ?

Thank you in advance. Best regards.