creating an entry on Exchange

[<af...@t-...>]

I´m trying to add an enty to an Exchange 5.5 server via LDAP.
I´m doing the following and get a "Constraint error": What is missing?

$neuEintrag = $conn->newEntry();
$neuEintrag->setDN("cn=LisaM,cn=Recipients,ou=Einklang,o=Einklang.");
$neuEintrag->{objectclass} = ["Top", "person", "Remote-Address"];
$neuEintrag->{rdn} = ["lisam"];
$neueintrag->{cn} = ["lisa mona"];
$neueintrag->{sn} = ["mona"];
$neueintrag->{givenName} = ["lisa"];
$neuEintrag->{distinguishedname} =
["cn=LisaM,cn=Recipients,ou=FAG002,o=FAG001"];
$neuEintrag->{rfc822mailbox} = ["lisa\@test.com"];
$neuEintrag->{mail} = ["SMTP:lisa\@test.com"];
$neuEintrag->{uid} = ["lisam"];
$conn->add($neuEintrag);
$conn->printError() if $conn->getErrorCode();

maybe this is the wrong maillist, because I´m using PerLDAP 1.4.
If so, could someone please tell me what the differences are.

Thanks in advance