How to change metadata especially values of a label attirbute?

SabaRG

Hi 
I have a label attribute that has some values. When I filter the example set to remove those records including a special value for their labels, the remind example set has that special value in its metadata, and my average precision and recall will be reduced even though my example set has not that value. I have to use the "Replace" operator to change that special value to another value till my metadata can be updated and my performance can be improved. I couldn't find any other operator to update metadata. Are there any other options for this task? If not, please consider a new metadata updater operator for the next toolbox operators.
Sincerely

kayman

The remove unused values operator should do that.