Editing mode of Page Properties Report Macro displays disabled save-button

It's not possible to change the settings of a already used existing page properties macro because the save-button is disabled.

1. Make a new page with a new page properties macro and use an existing label to get a result
2. Save the page
3. Edit the page
4. Edit the page properties macro
5. You cant's save any changes.
--> If you want to have a new report, the only way is to make a new page.