Leading characteristics could not be uniquely determined.

What causes this issue?

For updating the summarization data, the system must be able to
uniquely determine the leading characteristics: "summarizatation
version," "investment program (name)," "approval year" and "logical
system" for each data record. The system is not able to do so.
The error can have one of these causes:
One of the three characteristics "summarization version," "investment
program (name)," or "approval year" has a different entry in two
different data records.
The user entry for one of the characteristics "summarization version,"
"investment program (name)," or "approval year" does not agree with the
entry in a data record.

System Response

Data is not updated.

How to fix this error?

Make sure that your entries for the characteristics "summarization
version," "investment program (name)," and "approval year" are correct,
and that you selected the correct input files.
If all of the above is correct, and you are using a standard SAP
program for data selection, then contact the SAP Hotline.
If you are using your own program for the data selection, make sure
that the values of the characteristics "summarization version,"
"investment program (name)," and "approval year" are identical in all
data records.

Error message extract from SAP system. Copyright SAP SE.