Print Preview as PDF USMD2 240 Error message

Hello MDG gurus,

I've developed a simple printout form for my Custom MDG Data Model. Structures were generated and everything works just fine with the UI.
The Print Preview button is properly displayed and when I'm using it for a certain record it properly generates the PDF and displays it on the screen.

If there is an Open Change Request for the record though, the button is still displayed, but when I click on it I get the following message:
USMD2 240

Print preview not possible; error while creating Adobe PDF form

Is that the expected standard behavior or is that something that can and needs to be fixed?

Thanks in advance,

Boris