Uh, I've found the answer. When I use the webbrowser to do changes on the list I can't change the "Company"-field to a lookup-field, too. It's not envisaged to do that. So the answer is that I have to create a new field and (for example) hide the existing one. :sigh: With a little contemplation I would have sift it out before writing the question and perhaps I wouldn't have spend four hours on testing. But on the other side, perhaps someone will have the same question so I didn't deleted it and just answered it on myself. (I give it a five ;P )
------------------------------ Author of Primary ROleplaying SysTem How do I take my coffee? Black as midnight on a moonless night. War doesn't determine who's right. War determines who's left.