SAP Message WSS023 - No mapping for SAML authentication found (Issuer &3)

Diagnosis
The system received a SAML assertion, but it did not find a usermappingto authenticate the user.

Procedure
The certificate was trusted in the System PSE, but no mapping wasmaintained. Maintain the user mapping. Please refer to the SAPdocumentation and note 1254821.
SAML Issuer: &V3&
Certificate DN: &V1&&V2&
If you use report RSUSREXTID for maintaing the mapping, the followinginformation if usefull:
Type of External ID:SA
Prefix of External Name: &V4&
Name of Issuer: &V1&&V2&