Error Message while making dropdown selection

I have a cross tab which gets the axes values from 2 dropdown, dd1 & dd2 using document property, now when I make selection in dd1 then related values are shown in dd2. This dd2 values are used  as axes values, now when I change the selection in dd1 then values in dd2 changes but the document property of dd2 still hold the previous slection.

Due to this, i get the error "Could not find column: 'table.columnname'."

Is there any way to show a custom message on the crros tab?

(1) Answer