In case the link above doesn't work, try the following to access AIC 18.33:
http://www.caa.co.za/Aeronautical%20...lars/18.33.pdf
Tocum, Capslock is spot on - it's not possible to revalidate an SA licence on the strength of a foreign validation.
To revalidate your SA licence, you have to hold a valid, stand-alone foreign licence issued by a recognised civil aviation authority and every detail contained in AIC 18.33 has to be complied with.