This is the definition of 'actualisatie':
Regel die op een bepaalde datum en in functie van financiele elementen en kanselementen, het equivalent van op verschillende data betaalbare sommen vastlegt; dit equivalent wordt actuele waarde genoemd.
This translates as: Rule/regulation that determines, on a certain date and in function of financial elements and elements of chance, the equivalent of sums payable on different dates; this equivalent is called present value.
http://www.assuralia.be/fileadmin/content/documents/publicat...So a possible translation here could be:
The surrender value is determined in conformity with the rules/regulations to calculate the present value, as determined in Article XX.
Hope this helps.