This site has been specifically designed to troubleshoot all Siebel related issues. When any exception or error occurs in Siebel, the cause is given by a specific error code. Whenever we face an issue, we try to Google or search for a resolution mostly from Oracle Support, IT Toolbox, Siebel Unleashed etc. I have tried to search for all the solutions for a particular error code in all the mentioned sites and put all the solutions in this site.
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SBL-DAT-00133: Unable to lookup message. Message Category '%1' is undefined.