3626374 - EC-to-ECP: Error Code: PSS-UNK** - Error Message: Unknown argument exception

While Opening Direct Pay Statement from Employee's Profile in Employee Central, you are facing the following Unknown Argument error:

Error Code: PSS-UNK01, PSS-UNK02, PSS-UNK03, PSS-UNK04 OR PSS-UNK05
Error Message: Unknown argument exception.
Root Cause: there are several Root Causes and each have their own solution.

NOTE: this may also happen in the Payroll System Information screen.

• SAP SuccessFactors Employee Central Payroll

Error Code, PSS-UNK01, PSS-UNK02, PSS-UNK03, PSS-UNK04, PSS-UNK05, Error Message, Unknown argument exception, The referenced X509 Key Pair 'null' is no longer available, X509, Certificates, <EC Instance Name>_<System ID>_<Client>_ADM, <EC Instance Name>_<System ID>_<Client>_ESS, USREXTID, CERTRULE, SAP System Configuration, System ID, Client ID, eq is not supported for payDate, Invalid Date Format, Unsupported Operator Detected, Skip value exceeds total number of records , KBA , LOD-EC-ECP-SF-PST , EC Payroll Pay Statement , LOD-EC-ECP-PY , Payroll Integration EC to Employee Central Payroll , LOD-EC-ECP-SF-MAS , Employee Data Maintenance via Mashups , LOD-EC-ECP-GLO , Globalization , Problem