For the corporation sesta.com, if two DC nodes exist, dc=sesta and dc=sesta2, both referring to the organization node o=sesta, then in the attribute, you must specify the one that is an actual organization node:
inetCanonicalDomainName:sesta.com
Thus, in the following example, sesta.com is the canonical domain:
dn:dc=sesta,dc=com,o=internet inetDomainBaseDN:o=sesta.com
dn:dc=sesta2,dc=com,o=internet inetDomainBaseDN: o=sesta.com