Diagnosis
None of the previously chosen time characteristics are permitted as areference characteristic for the non-cumulative value.
Please note that only the following time characteristics are permitted:
0CALDAY
0CALMONTH
0CALQUARTER
0CALWEEK
0CALYEAR
0FISCPER
0FISCYEAR

Procedure
Transfer at least one of the time characteristics above into the datastructure and then define the reference characteristic again.