Dynamic Listbox Items in Survey

Hi,

in a survey I use listboxes. These listboxes have to be filled dynamic from a customizing-table. I wanted to do this within the PBO-function, that is assigned to the survey.

I thought I can do this with method DYNAMIC_ITEMS_ADD in class CL_CRM_SVY_VALUES but the listbox does not changes.

Any ideas?

TIA

Adrian Ranfft