SMI pseudo tables

I have various large databases with many tables that have been loaded by various users. I need to make the owner of these tables consistent so that I can create applications using COGNOS. The sql in COGNOS queries uses the owner of the table as well as the table name. So I tried the following sql in the sysmaster database.. update systabnames set owner ="" where dbsname ="ltdnl" with the result: $ finderr 346-346 Could not update a row in the table. While processing an UPDATE, the database server received an unexpected error. Check the accompanying ISAM error code for more detailed information on the cause. Possible causes include hardware errors and locking conflicts. $ finderr 158-158 ISAM error: Operation disallowed on SMI pseudo table You have attempted an SQL operation that is not supported on SMI pseudo tables. Try another. Has anyone else had experience of this, I dont really want to unload and re-load tables with lots of extents just top change the owner........... Tony Reynolds, NEC Group, Birmingham , UK 8-))