See Fair Work 2009 Act s.185(5) & reg 2.06A
An enterprise agreement must be signed before an employer or a bargaining representative can apply to the Fair Work Commission for approval.
A copy of an enterprise agreement is a signed copy only if it has been signed by the employer, and at least 1 representative of the employees, covered by the agreement.
The signature of the representative does not bind the representative to the agreement, unless the representative is an employee who will be bound by the agreement.
While it is necessary to have at least 1 representative of the employees sign the agreement, it is not necessary for every representative to sign the agreement.
The signed copy must include the full name and address of each person who signs the agreement; and an explanation of the person's authority to sign the agreement.