Specifies which attributes are required when a user is created. This attribute uses the following syntax:
DestinationAttributeName=SourceAttributeName
If the source attribute name is missing, the default is the user ID (uid). For example:
cn sn=givenName
Both cn and sn are required in order to create a user profile. cn gets the value of the attribute named uid, and sn gets the value of the attribute named givenName.