Does your object method <b>have</b> any import/export parameters?
Check it in SWO1 by displaying your object type, selecting the method and pressing the parameters button in the toolbar.
I wouldn't be surprised if the workflow builder actually checks that there are parameters and disables the binding button if there are none.
PFTC, use TS as type and type in the task number.
Now click change.
There you'll see description, text and objectmethod.
type in the objecttype and the method and press enter. Now notice the green icon somewhere below the text method. this is the binding button.
This is also accessible via the menu: path goto
Kind regards, Rob Dielemans