第4條
Insofar as it has been customary in a Contracting Party to determine the profits to be attributed to a permanent establishment on the basis of an apportionment of the total profits of the enterprise to its various parts, or on the basis of such other method as may be prescribed by the laws of that Party, nothing in paragraph 2 shall preclude that Contracting Party from determining the profits to be taxed by such apportionment or other method; the method adopted shall, however, be such that the result shall be in accordance with the principles contained in this Article.