I am trying to integrate 5 fex files into a compound report using PDF Layout painter. While running the compound report, I am facing issues like getting WebFocus error message (a value is missing for &groupid), the report running into several pages. This happens when I put multiple reports in the PDF Layout Painter (single report runs fine, though it spills over into a couple of pages). In other words the compound report never gives me an output.

You may use FORMAT PDF OPEN and FORMAT PDF CLOSE to get your compound reports. Then it may be easier for you to debug.