Foreign key on IMAP server is failing

Description

When changing the CN of an IMAP server and changing its base at the same time the foreign key on CN is not correctly updated.

FusionDirectory Version

demo-dev

Steps to Reproduce

1. Create an IMAP server
2. Link it to a user
3. Rename and move the server at the same time
4. Check the gosaMailServer LDAP field value

Expected behavior:

It should contain the new CN

Actual behavior:

It contains the old one

Additional Information

Also it seems the mail server cache is not cleared as it should. I’m still openning this in core as the main problem is most likely in the foreignKey system. I will move it if needed.