1. When rendering its decision, the Tribunal established under this Section shall apply this Agreement as interpreted in accordance with the Vienna Convention on the Law of Treaties, and other rules and principles of international law applicable between the Parties. 

2.  The Tribunal shall not have jurisdiction to determine the legality of a measure, alleged to constitute a breach of this Agreement, under the domestic law of the disputing Party. For greater certainty, in determining the consistency of a measure with this Agreement, the Tribunal may consider, as appropriate, the domestic law of the disputing Party as a matter of fact. In doing so, the Tribunal shall follow the prevailing interpretation given to the domestic law by the courts or authorities of that Party and any meaning given to domestic law by the Tribunal shall not be binding upon the courts or the authorities of that Party.   

3. Where serious concerns arise as regards matters of interpretation that may affect investment, the Committee on Services and Investment may, pursuant to Article 8.44.3(a), recommend to the CETA Joint Committee the adoption of interpretations of this Agreement. An interpretation adopted by the CETA Joint Committee shall be binding on a Tribunal established under this Section. The CETA Joint Committee may decide that an interpretation shall have binding effect from a specific date.