SFS REVOKE AUTH question

[Gentry, Stephen]

I am trying to REVOKE AUTH for an SFS user.  The directory, let's call
it VMSYS:MAINT.PUBLIC   has had a GRANT AUTH PUBLIC  done to it earlier.
I have a specific user I do not want to access this directory.  When I
issue the REVOKE AUTH, (specifically:  revoke auth vmsys:maint.public
from steveg) I get  DMSJAU1138E File sharing conflict with a return code
of 70.
The user is not logged on when I issue the command.
Is the PUBLIC authority causing this problem?
Thanks,
Steve