The Change Library: Initial Screen appears.

If you delete existing library characteristics, basic key figures, or key figures, an error will occur during the next generation of any reports in this library that still use the deleted characteristics, basic key figures, and/or key figures.
Also, if you change and/or add a default selection set for a characteristic, the default selection set will only appear when you create future reports; the default selection set will not appear for reports that were defined before you changed or added the default selection set.