Results analysis key required to update in results analysis version &

What causes this issue?

For <DS:GLOS.results_analysis_version>results analysis version</> &v1&,
you specified in Customizing that the
<DS:GLOS.results_analysis_data>results analysis data</> (such as
<DS:GLOS.work_in_process>work in process</>, reserves, and cost of
sales) are to be written under separate cost elements for each
<DS:GLOS.results_analysis_key>results analysis key</>. This means that
you must enter a results analysis key when you maintain the update
rules.
If you want to update the work in process and the cost of sales under
the same results analysis cost elements, turn off the <LS>Update
results analysis key</> indicator in results analysis version &v1&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter a results analysis key, or turn off the <LS>Update results
analysis key</> indicator in results analysis version &V1&.

Error message extract from SAP system. Copyright SAP SE.