Is there a way to make Spouse/DP life require a Spouse or Domestic Partner?

Summary: Our Supplemental Spouse/DP Life plan allows employees who do not have a spouse or Domestic Partner. The plan should only be electable by those who have a spouse or domestic partner for all others it should default to waive. What is the best practice for this?

Content (required): Spouse life should require an employee to have an Spouse or Domestic partner to enroll otherwise it should be set to waive. Currently employees can elect the plan without a spouse/DP.

Version (include the version you are using, if applicable): 23 C

Code Snippet (add any code snippets that support your topic, if applicable):