Guys,
Unfortunately someone has selected one table in the object definition tab of object Edit window. Actually the table is not required at all, because the object is a user defined date variable object in the universe which won't depend on any table.
User Object code: trunc(sysdate,'mm')
I can re create a new object in place of the existing object without selecting any table for this but it will impact the existing reports which depends on the old object.
Let me know if you need any info..
Appreciate your ideas..