6.1.3 If it is considered that either Party is liable to the other, compensation shall be payable only on the following terms:
(a) such compensation shall be limited to the amount of reasonably foreseeable loss and damage suffered as a result of such breach, but not otherwise;
(b) in any event, the amount of such compensation shall be limited to the amount specified in Clause 6.3.1;
(c) if either Party is considered to be liable jointly with third parties to the other, the proportion of compensation payable by that Party shall be limited to that proportion of liability which is attributable to his breach.