1. Open the main constituent record.
  2. Click the Spouse button. This should open the spouse, who should be a non-constituent.
  3. At the top, go to Relationships, Break Link with [spouse name].
  4. Select Break Link AND delete the constituent record for this relationship.
  5. Go back to Integration and Synchronize Data to reflect all Changes.
  6. In Link Records, locate the individual, right click and select break link
  7. Right click again and select add individual.