using the Generic LDAP Agent, the latest eDirectory (8.8.SP8 (20806.01) and FIM Version (4.1.3627.0)) I encounter the following problem in very special situations (namely when the value in eDirectory only differs from the FIM value by different upper/lower case letters:
NDS error: duplicate value (-614)

DirectoryOperationException: (0) 0 Server Message: The attribute exists or the value has been assigned.

I don't see that as a Problem, when it is in fact doing string comparison.  You may need to write an advanced flow rule to simply say something like this

CSHARP Snippet.  (if not equal, case does not matter)

if !(csentry["co"].ToUpper().Equals(mventry["co"].ToUpper()))

{

 csentry["co"].Value =mventry["co"].Value ;

Thank you very much for your reply!

I will write Rules extensions as you suggested. But I need to call this function for almost any attribute which might slow down the replication.

Best regards,
Rainer