SAP Solution manager USER_AUTH_FAILED - SLD authorization issue

Symptom

Error: USER_AUTH_FAILED when entering the username and password? to logon to local SLD.

Environment

    SAP Solution Manager 7.1
    SAP Solution Manager 7.2

Reproducing the Issue

    Execute transaction Solman_Setup.
    Select System Preparation -> Prepare Landscape Description -> step Select SLD (Solution Manager 7.1)
    or Infrastructure Preparation -> Set Up Landscape Management -> step SLD Connections (Solution Manager 7.2)
    Click the Button 'Select Local SLD' where you enter a Username and Password
    Results with USER_AUTH_FAILED.

Cause

Missing authorization for the user which is used to logon to SLD. The user should be a system user too.

Resolution

SAP recommends to use the user 'SLDDSUSER' in step Select SLD (Solution Manager 7.1) / SLD connections (Solution Manager 7.2).
The user SLDDSUSER in the SAP Solution Manager is required by the SLD data suppliers to write technical system information into SLD.

The user in step Select SLD (Solution Manager 7.1) / SLD connections (Solution Manager 7.2) requires UME role: SAP_SLD_DATA_SUPPLIER to create, modify and delete CIM instances of the landscape description subset as a data supplier without access to the SLD User Interface.
For an SLD as of release SAP NetWeaver 7.1 user needs also the role SAP_SLD_CONTENT_SYNC.
For an SLD as of release SAP NetWeaver 7.0 user at least needs the role SAP_SLD_GUEST.

This user should be defined as a System User.