unable to add or remove a user from shared address book or shared folder

Unable to add or remove a user from shared address book or shared folder.
The GroupWise Client (before GroupWise 8 SP2) will crash.
The GroupWise Client (after GroupWise 8 SP2) will display an error that something is wrong.

A user to whom an address book or a folder has been shared is moved to another PostOffice.
The shared folder or address book have been created with a client earlier the GroupWise 7 Support Pack 3.

In GWCHECK / Content there is the following error:
76 Folders/books with distribution list problems

The only solution for this problem is to remove the share, restart the client, share the folder or address book again and add all users. All user will receive a message that the share has been deleted and later that the have been granted access to a shared folder or address book.