Any subjects taken in another country must be included in your study programme, which means they must be approved by the Board of Examiners. The Board will verify that the subjects are at an appropriate level, and that their content does not overlap with those you have already completed.
WHEN DO I NEED TO REQUEST APPROVAL?
When you are certain which subjects you will be taking. Usually this is right before your departure, or shortly after your arrival at the partner university.
HOW DO I REQUEST APPROVAL?
The Approval and Exemptions website explains how to submit an application to the Board of Examiners.