Diagnosis
You tried to delete a rule which may not be deleted - for example,because it was generated automatically.

System Response
This rule cannot be deleted.

Procedure
In rule which was generated automatically, you can set the percentagevalue to zero.
For capital investment measures (orders/WBS elements) you cannot deleteor change the settlement rule for periodic settlement to assets underconstruction.
With maintenance orders, the time (system status) of order processingfrom which the distribution rule of asettlement rule must existis defined in Customizing. The settlementrule created automatically or manually at this time may no longer becompletely deleted subsequently (including the last distribution rule).