Secretariats in Bilateral Trade Agreements

This is from the newly released text of the EU - Japan Economic Partnership Agreement:

ARTICLE 21.25

Administration of the dispute settlement procedure

1. Each Party shall:

(a) designate an office which shall be responsible for the administration of the dispute settlement procedure under this Chapter;

(b) be responsible for the operation and costs of its designated office; and

(c) notify the other Party in writing of the office's location and contact information no later than three months after the date of entry into force of this Agreement.

2. Notwithstanding paragraph 1, the Parties may agree to jointly entrust an external body with providing support for certain administrative tasks for the dispute settlement procedure under this Chapter.

Paragraph 2 seems like it envisions the possibility of setting up something like a secretariat ("an external body") to oversee dispute settlement. This is the first time I've seen such a provision in a bilateral trade agreement. Are there any other examples of this? Given the problems we have seen with NAFTA dispute settlement, an independent secretariat could be helpful.