Diagnosis
You tried to delete a posting run that has already been posted or notyet been rejected.

System Response
The system always has to reject deletion of posted posting runs toensure correct accounting.
Other posting runs must be in 'Rejected' status before they can bedeleted, because the trips must be reset to 'Accounted' beforedeletion. This is exactly what happens when a posting run is rejected.
An exception is 'No documents created'. In this case deletion can beperformed directly since the status of the trips was not changed.

Procedure
Reject posting runs that have not yet been posted before you try todelete them.