Perhaps slapadd/slapd should be able to deal with such duplicate entries better, to make it more obivous what's wrong? I'm just saying :)
What options did you use with slapadd? If you used -q, this is probably expected. If you did not, I suggest filing an ITS, although slapadd is never really as strict as ldapadd will be. It is meant for loading LDIF created by an export, which should already be sane.
--Quanah -- Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration