You can merge source records together only if they originated from the same external system. The source records can belong to the same object profile or to different profiles. When the merge includes different object profiles, the profile from which the source record is merged is called the merge from profile; the object profile into which the source records are merged is called the merge to profile. If you merge the only active source record in one object profile into a source record in a different object profile, the merge from profile is deactivated (since there are no active source records remaining, there is nothing from which to create the SBR). During a source record merge, you can select fields from the non-surviving source record to be retained in the surviving source record.