For Distribution group you are providing a MailNickname and probably in your setup you are flowing this mailnickname with synchronization rule to AD. Simplest solution is to modify your synchronization rule to flow MailNickname to samaccountname of this
Distribution group in AD as well.
Assuming that your mailnickname will be unique (it should be anyway, but AD is not validating this) you should be OK with it.
So just add a flow mailNickName -> samAccountName in your synchronization rule and you will be fine.
Tomek Onyszko, memberOf Predica FIM Team (http://www.predica.pl), IdAM knowledge provider @ http://blog.predica.pl
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