Hi Rajan,
This looks like a Studio Pro issue rather than an issue with your application or the PDF Document Generation module itself.
A few things you can try:
- Create the microflow first from the App Explorer, then select it in the Page Loading Microflow property instead of clicking New.
- Try the same steps in a brand-new blank project to confirm it's reproducible.
- If it still occurs in a clean project, I'd recommend raising a Mendix Support ticket and attaching a sample project along with the reproduction steps.
If anyone else can reproduce this in a clean project, it would further confirm that this is a Studio Pro bug.
Kindly mark this as the accepted answer if it helps.