Diagnosis
When you reverse a mass simulation run, you can then bill theinstallation again. The new bill is generated for the extrapolationperiod for the installation interval that has not been billed yet.These intervals should be identical to the billing periods for thedocuments you want to reverse.
These intervals must be identical to ensure that the reversal andrepeated billing will result in a correct extrapolation. If they arenot identical, some intervals may not be billed or may be billed twice.
During the analysis of unbilled periods for installation &v1&, billingperiod &v3& to &v4& was determined for contract &v2&. However, nodocument to be reversed was found for this period. Therefore, thereversal is not possible.
Possible causes could be:

• The simulation document has already been deleted


• The installation was billed based on actual results in the interim


• The scheduling data has been changed

As a result of these circumstances, you cannot reverse the masssimulation document.