Try adding the top-level object, which may be missing, but don't worry if
the add operation fails.
--- MigrationTools-26/migrate_all_online.sh	Wed Oct 25 16:27:02 2000
+++ MigrationTools-26/migrate_all_online.sh	Wed Oct 25 16:30:11 2000
@@ -179,5 +179,30 @@
 echo "Migrating netgroups (by host)..."
 $PERL -I${INSTDIR} ${INSTDIR}migrate_netgroup_byhost.pl	$ETC_NETGROUP >> $DB
 
+# Try to add the top-level object, because it's usually missing.
+TYPE=`echo $LDAP_BASEDN | cut -f1 -d=`
+TOP=`echo $LDAP_BASEDN | cut -f1 -d, | cut -f2 -d=`
+CLASS=$TYPE
+if [ "$CLASS" = "dc" ] ; then
+	CLASS=domain
+elif [ "$CLASS" = "o" ] ; then
+	CLASS=organization
+elif [ "$CLASS" = "l" ] ; then
+	CLASS=locality
+elif [ "$CLASS" = "c" ] ; then
+	CLASS=country
+elif [ "$CLASS" = "nismapname" ] ; then
+	CLASS=nisMap
+elif [ "$CLASS" = "cn" ] ; then
+	CLASS=container
+fi
+
+cat << EOF | $LDAPADD -h $LDAPHOST -D "$LDAP_BINDDN" -x -w "$LDAP_BINDCRED"
+dn: $LDAP_BASEDN
+$TYPE: $TOP
+objectClass: top
+objectClass: $CLASS
+EOF
+
 echo "Importing into LDAP..."