No actor on putfile audit trail for sbtape

After uploading the file 'logback.xml' to all pillars, the sbtape2 delivered the following audittrails to the auditservice:

FileID Reporting component Actor Action Timestamp Info Message from client
logback.xml sbtape2 PUT_FILE 13.08.13 09:46 (Succeeded)
logback.xml sbtape2 jolf's cmdline client OTHER 13.08.13 09:46 Protocol initiated (Succeeded) Standard approve

Thus no actor on the PUT_FILE operation, unlike all the other pillars (including sbdisk, which though had an audit of type 'OTHER' without the actor)