shared folder Problem ACL setting multi domain environment

[Gerald Raaf]

hi,

when i create a shared folder i run into the following problem.

Aug  4 11:54:12 risa imap[8713]: open: user gerald at xxxx.yyyy opened 
INBOX/Kontakte
Aug  4 11:54:13 risa kolabd[8688]: Y Warning: Unable to set the ACL of user 
`test1 at zzzz.yyyy' in mailbox `shared.aufgaben at xxxx.yyyy' to lrsiwdap, Error = 
`test1 at zzzz.yyyy: lrsiwdap: Invalid identifier'
Aug  4 11:54:13 risa master[8715]: about to exec /usr/lib/cyrus/imapd
[/code]

some explanation:
in kolab i have users with domain xxxx.yyyy and zzzz.yyyy.

When i create a shared folder for domain xxxx.yyyy and grant access to a 
member from domain xxxx.yyyy everything works fine. If i want to add access 
to a member from domain zzzz.yyyy i get the above error message.

my question is, is this a bug or isn't it possible to share folders between 
different domains.

kind regards
Gerald