Smartform for Service Order (IW31)

Appologies if this has been answered before. I've done a quick search and found it asked before, but no answers.

Hopefully some of you experts can help me out.

I have created a smartfrom to print the details of a service order (from within IW31 or IW3D, say).

My problem is as follows...

If I click Order->Print->Print Preview->Print, it prints out perfectly. However if I click Order->Print->Print, the form is printed with no data.

It's almost as if the script that calls the smartform isn't being run correctly in the second case as all the internal tables being passed to the smartform are empty.