Any party to a dispute about a matter of mutual interest may refer the dispute in writing to the Commission, if the parties to the dispute are-
on the one side-
one or more trade unions;
one or more employees; or
one or more trade unions and one or more employees; and
one or more employers' organisations;
one or more employers; or
The party who refers the dispute to the Commission must satisfy it that a copy of the referral has been served on all the other parties to the dispute.