Catalog dbspace used to store System tables, views, stored procedures, SQL Anywhere tables, and function definitions. In IQ Simplex mode, you might be able to create your own SA table for certain loging purpose;
however, in IQ Multiplex mode, you had better use dedicated IQ table for loging purpose to avoid the confliction when catalog synchronization between primary and secondary servers.
HTH ! Thanks !!
Regards,
Robert