POSIX Permissions on a Mac

We are having permissions issues on our mac server.  A user has stated they have read access to a folder but not write.  I have found that there is an ACL giving them Full control but a POSIX permission giving them none.  I would like to remove the POSIX permission entirely but the "-" button is grayed out.  Is there a way around this to let me remove the POSIX permission?  Just a single user not the root and admin entries...
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I have no used Mac for a long time, please read the following doc to see if you can fix it:

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nappy_dThere are a 1000 ways to skin the technology cat.Commented:
Is this on a Mac Server or workstation?

In either case, you need to chage the POSIX group.  Make this group a group that your users are in and then recursively apply it to the share via your workgroup manager and Server Admin utilities.
hdaincAuthor Commented:
I was able to use both suggestions.  I had to take ownership of the folder to remove them from the POSIX permissions.  I was then able to propagate the ACL successfully.  Thanks!
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