Errors in the Execution of the SDBUPD Program 
If an error occurs when you execute the SDBUPD program, the program terminates with a message describing the cause of the error unless you specify a converse option in the execution command (See Overview of Options for the SDBUPD Program).
Frequent Causes of Errors:
An unexpected error occurred when you executed SDBUPD.
You are attempting to use SDBUPD to switch to a software version that is lower than your current version (called a downgrade in the following).
Examples of this situation:
You selected the wrong software version by mistake.
The upgrade of the database terminated with an error. You then tried to use SDBUPD to return to the original software version.
The database upgrade was successful, however, you want to return to a lower software version for other reasons.
NoteYou cannot use the SDBUPD program to downgrade software. If you want to use SDBUPD, the new software must have at least a higher build number than the existing one.
End of the note.
Activities
Downgrading Server Software, No databases Exist Yet:
More Information
Glossary, Version