Delete-Add

A delete-add is a special operation in the sync engine. It occurs when there is a delete operation staged for an object and at the same time there is an add for another object with the same DN. In this case, the delete must be processed before the add, or it will obviously fail.

In case the delete operation fails, then the add will be suppressed and not sent to the connected directory.

You want this behavior when you need to change the anchor of an object or for some other reasons want the object to be refreshed. For example, you might have a corporate policy saying that an employee who becomes a contractor must have their AD account deleted and recreated so no permissions assigned to it directly are preserved.