Depending on the user's profile, it can be available button "DELETE SELECTED LABELS" which can be used to cancel labels already approved.
The deleted labels are removed from the approved labels and they appear in the requested ones.
Before deleting the labels, the software asks a confirm.
In case of affirmative answer the label is deleted (it is a logical elimination, because physically the label is stored in the database even if it cannot be used anymore).
Every cancellation activity is recorded in a log file.