SQLContainer and ComboBox

How do you set the “id” column?

I know I can set the “Caption” column with setItemCaptionPropertyId, I just don’t know how to set the “id” column. All the code I have seen so far assume a column called “id”, which does not apply in my case.

As a clarification, I have a DB column called “skusku” that will be the “value” of the combo box, and a column called “skudsc” that will be the caption.