ACLs, Drop Boxes and AFP

OK, bit of an odd one this. I'm trying to setup a drop box for a user on a 10.4.9 server. The user has a folder setup as a sharepoint (called Test). Inside Test there are 3 folders, 2 are just set to read-only, which is fine. The 3rd folder (called Files In) is intended to be a drop box. I've tried every set of ACLs that I can imagine, starting with the Apple recommended ones, but currently they're set so that the user test has: Allow: Read & Write Deny: List That should set it up as a drop box, and it does come up with the right icon in the Finder, and the right message when you drag a file onto it. However it starts to copy a file across but then comes up with the error "The operation cannot be completed because you do not have sufficient privileges for some of the items". It doesn't copy the file across after that. What's weird is that if I set the parent folder to read/write, and drag the file to that, I can then copy it into the drop box without a problem. It's just taking the file directly from a client Mac to the drop box that's the problem. Clients aren't bound to the OD so they're just logging in to drop files off. It looks like it may be something to do with the owner name of the file, as when a file is copied to the parent folder it gets it's owner set to the username of the account that has logged in. Anyone any ideas? Thanks, Skaff