Warning: Rule or slice definition was changed on &1

What causes this issue?

You have retrieved stored results for a rule for which either the rule
or the slice definition may have changed since the results were saved.
This means there could be an inconsistency between the way the saved
results are displayed (using current definition for column headings,
slice names) and how they were stored. In some cases, the program may
not be able to process the stored results.

System Response

The report proceeds to report using the stored results.

How to fix this error?

Investigate the changes made to the slice or rule definition. Keep in
mind that all data selection and totalling operations have already been
performed, so changes to the data selection criteria or the derivation
data used to assign values to the various subtotals have no effect on
the report.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.