Hi Tjaff,

There are two ways to do so.

#1
1) Select the constructor operation in either Diagram or Structure Tree
2) Go to the property view (Left bottom pane of astah*/JUDE), it should show the property of the constructor operation
3) Go to [Base] tab and clear the [Return Value] field



















#2
1) Double-click on the constructor operation directly in the Diagram Editor






2) Clear the Return Value described after ":" (It says "Void" in this sample figure)






3) Return Value disappears from the Class






Cheers,
Satomi