SAML2 Authentication for AS Java NetWeaver 7.5 with different user names

Hi everyone,

here is a question on AS Java Single Sign on.

We have a third party SAML2 Identity Provider with user name in the format XXXX.

There is a SAP Enterprise Portal running on a SAP NetWeaver AS Java 7.5 which uses user names in the fixed format UXXXX. That means you can tell the rule "U"+(SAML2 User Name) = Portal user name.

We would like to configure the portal as SAML2 Service Provider consuming authentication via SAML2.

Is it possible to do an generic automatic mapping of the user names according to the rule described? How could I tacle this challenge?

Best regards

Ingo