Identity Manager

Update record from Null Import

I have a requirement for the lack of a record in a data source to flow null to an attribute.

For example, I would be importing from a HR source to create Person objects in 1IM then a second source called TelephoneBook that just updates the Person object with the persons telephone number when it finds a match. The entry for a person in the TelephoneBook could be removed at some stage and this would indicate that the phone number should be removed from the user ie. The record is deleted in TelephoneBook.

Is there a way in 1IM to flow null to the phone number of the person when there is no corresponding entry in the TelephoneBook?