Thanks for your fast response.
From his reply:
One way to do this is to name the fields you want to hide in the same way, for example all starting with %, then in your loading script put in
after reload, open any chart properties and uncheck "Show system fields" at the bottom of the Dimensions tab and click OK to save the change.
By doing this, all fields with names starting with % are considered to be system fields and will not show up in current selection
Is it suitable for the case with Chart which has dimensions tab?
My field will be chosen from listbox, so i couldn't find "Show system fields"...