WDA Table with different values in dropdown per row

Hi,

I'm developing a table in a Web Dynpro ABAP.

One column has a DropDownByKey.

I want to have different value sets for the drop down per row for this column.

               | Column 1                                                                                                         | Column 2

Row1      | (drop down with "Cost Center" and "Order")                             | .....    

Row2      | (drop down with "Cost Center", "Order" and "Project")               | .....    

Which values are available in the drop down depends on the value in column 2.

I know that this is not possible by using the SET_ATTRIBUTE_VALUE_SET method.

How can I achieve this?

Regards,

Sven