enacted by the Constitutional Assembly of South Africa and amended by the Parliament of South Africa

“ An international agreement of a technical, administrative or executive nature, or an agreement which does not require either ratification or accession, entered into by the national executive, binds the Republic without approval by the National Assembly and the National Council of Provinces, but must be tabled in the Assembly and the Council within a reasonable time. ”

“ Any international agreement becomes law in the Republic when it is enacted into law by national legislation; but a self-executing provision of an agreement that has been approved by Parliament is law in the Republic unless it is inconsistent with the Constitution or an Act of Parliament. (5)
The Republic is bound by international agreements which were binding on the Republic when this Constitution took effect.
Customary international law
232. ”