Benefits:Error while saving unrestricted enrollments

Summary:

We have Pension Plans configured as Plan not in program and we are processing it using the unrestricted life event. Also we are using same element for all options in the same plan which is the standard benefits configurations.

Scenario: First time employee enrollments are loaded using HDL and element entries are created. Second time when the employee is trying to change the enrollment we are encountering error.

Error: There was a problem saving the elections because another enrollment exists in the same element that this enrollment uses.

Looking for advice is anyone has faced this issue before?

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