After applying Maintenance for CA Output Management Web Viewer 12.1 (or 12.1) , the build number remains the same.
The log for the install of the maintenance, located in the CA_OM_Web_Viewer/uninstaller/Logs directory showed the following error:
ERROR - build.xml:114: Error while expanding /tmp/629488.tmp/CAOMWebViewer12.war
java.io.IOException: EDC5133I No space left on device.
There is a lack of temp space ...specifically in the /tmp folder.
The System Property you need to set is: lax.nl.env.iatempdir
Here is an example:
java -Dlax.nl.env.iatempdir=/u/v012345/tmp -jar CA_OM_WebViewer_12_Updt.jar
where /u/v012345/tmp is your new tmp folder with at least 8 meg of space.