3021439 - SAML configuration fails

1. Configuring transaction SAML2 you get the error "New trusted provider can not be saved. You can get more information by collecting traces using tool http(s)://host:port/sap/bc/webdynpro/sap/sec_diag_tool?sap-client=XXX"
2. Taking SAML trace gives error:

SAML20 SP (client XXX):  Exception raised:<br>SAML20  SAML20 CX_SAML20_CORE: PSE was not found. Long text: PSE was not found.
SAML20 SP (client XXX): Error occurred: {PSE was not found. }

SAP Netweaver ABAP server

SAML 2.0, Identity Provider, Service Provider, IDP, SP, New trusted provider, New Trusted Identity Provider, can not be saved, SAML 2.0 Configuration, SAML2 Configuration, SAML configuration, Upload Metadata File , KBA , BC-SEC-LGN-SML , SAML 2.0 for ABAP , Problem