HDL Load file for Relationship Start date in Release 13

Summary

HDL Load file for Relationship Start date in Release 13

Content

Hello, 

In release 13, There is a new column introduced in Contacts (self service and benefits)  page as Relation ship start date. To use this functionality, Do we need to do the cleanup for the existing contacts in the system to add the Relationship start date and is it possible to load the Relation ship start date (which is introduced in release 13) using HDL? Looking for some suggestions.  Thank you!