Here you can clone an entire entry(all name-value pairs) to another DN. this means all values are copied except the DN, which is specified by the user in the input field, and the RDN (Relative Distinguished Name), which gets the value of the first part of the DN. Therefor you must specify the full DN in the input field i.e. ou=People,dc=example,dc=com is a full DN and has ou=People as RDN.