Diagnosis
There are error records from the actual cost determination forconfirmation &V1& with confirmation counter &V2& that are currentlybeing reprocessed by another user.
It is therefore not possible to execute the cancellation of theconfirmation.

Notes
The confirmation &V1& / &V2& possibly resulted from a milestoneconfirmation and therefore need not be identical to the confirmationthat was entered by the cancellation transaction.