MS Dynamics CRM 2011: Unexpected error in Audit History upon deleting user team

MS Dynamics CRM 2011: Unexpected error in Audit History upon deleting user
team

We have an issue with an unexpected error in the audit history of
contacts. The error appears since we have deleted a user team from the
system.
Tracing the error delivers the message: "Crm Exception: Message: team With
Id = b14b1a72-... Does Not Exist"
The auditbase table contains a row with the team id in the field "change
data" for the contacts. Update rollup of CRM server is 11.
At the moment we see two possibilities: - Restoring the teams out of a
backup: single data rows have to be restored. - "hard deleting" the affect
rows from table auditbase: critical?
Are there any other ideas or hints? Has anyone already deleted entries
from the audit table?
Thanks in advance
Alex