statistical key figure groups, see the IMG under "Controlling:
Note on Validity Period
Note that groups have no validity periods. However, most master
data is time-based.
For more information, see the R/3 Library under "Controlling
-> Cost Center Accounting -> Cost Center Accounting Component
Administration" in the sections "General Information on Master Data
Maintenance -> Master Data Groups" and "Statistical Key Figures
-> Statistical Key Figure Groups".