SAP Message /POSDW/PCA_SECURITY020 - SSFV: An exception (&1) has occurred during decryption (&2)

Diagnosis
An exception occurred in the Secure Store and Forward with VersionedKey function, causing the decryption of the encrypted entity to fail.The exception code stated in the error message gives a first indicationof the reason for the error. The following exception codes are possiblein the case in hand:
'1' : Unknown SSF application
'2' : Key version not found
'3' : No SSF library available
'4' : SSF kernel error.

System Response
The system terminates the process.

Procedure
Depending on the particular exception code, the following initialmeasures can be taken to eliminate the error:
'1' : If you use decryption for objects that were encrypted for thetransfer to POSDM, check whether an existing SSF application forversioned keys has been defined in the security profile of POSDMCustomizing (section Parameters for Encrypted Transfer). If not,assign an existing SSF application.
'2': Check whether the data sent to POSDM contains a key version(public key) for the SSF application used, that exists in the SAPsystem. You can view all key versions in table SSFVKEYDEF. Thisexception typically occurs if the key version has not been defined inthe SAP system. The exception can also occur with a key version that hasbeen defined in the SAP system but does not match the version used toactually encrypt the data. The correct key version is the prerequisitefor decrypting encrypted data.
If this exception code is reported, the message contains the SSFapplication and the key version that caused the error at the end.
'3': Check that SAPCryptolib has been installed, see Note662340. If this is not the case, install it.
'4': Report the problem to SAP Support under the componentBC-SEC-SSF.
If you have any other questions, contact SAP Support.