Steps to Change Employment Model for Legal Employer

Summary:

We erroneously configured a Legal Entity with the wrong Employment Model "2 Tier - Multiple Contract - Single Assignment" when it should have been "2 Tier - Single Assignment". We cannot import Workers as we don't have Contract information to provide, so we are attempting to change the Employment Model configuration for this Legal Entity/Employer.

Can someone walk us through all the steps needed to get this done? We're stuck trying to ensure "no work relationships exist in the enterprise or legal employer". We tried reassigning all employees to a different Legal Employer, but we're still getting an error when trying to change the config.