No individual may serve in the same case in more than one of the following roles: parent educator, attorney, guardian ad litem, screener, mediator, custody investigator. An organization may provide more than one of these services in the same case if the services are provided by different individuals, the organization has established written procedures to prohibit the exchange of information between such individuals, and the court approves of these procedures; however, no organization may provide more than one of these services in the same case if the arrangement violates the code of ethics, conduct, or professional responsibility of the organization or the individuals providing the services.