UseBTS is a WikiTag that means here is something that should be recorded in the ["BTS"] instead of tracking it in the wiki. Verify that the bug exists in the current version of the software, file a bug against the appropriate package, and then link to the bug instead of using the wiki as a bug tracking system.
FixMe: how do we make this into an actual WikiTag?
If you fix it, you can remove the UseBTS tag.
Here is the list of pages containing the UseBTS WikiTag
?FullSearch(linkto:UseBTS)