We deployed a feature that installs a custom site column named "Classification." It is a Choice column type. Now, we need to change the choices. We can update the XML in the feature easily enough, but it doesn't affect any of the lists already used the existing site column; they still see the old choices.
Is there any way to send a refresh signal or something to the lists that use our Classification site column feature to have those lists use the updated choices?
I think the only way to archive this is by iterating each list that uses the column and change the XML there as the column within a list has no reference to the original column any more.