Hi,
in real it is a multi-master-replication. So the constraints have to define on both sides.
I have check the entry, more than one time. (many more) so i really sure, it is valid. (changed the attribute to another value and back on the procurer)
I think it is a tricky timing problem, and it appears only in special situations. I found it, in a restore of a system with an backup. After imported it in the procurer1, I started the second one. At the next morning the sync wasn't complete. And I wondered why.
Another test shows the problem, a little bit more. I changed the order of the entries in the initial.ldif (groups in front of users), and the sync works.
In the last message, was a little type. In the database only 6 entries (not 56)
Sascha
PS: sorry my English is not very well