Opening with a non flat top cannot be mulled underneath another opening


allopher
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Hello,

 

I'm trying to create a mulled unit (see image).  But am getting the error "Opening with a non flat top cannot be mulled underneath another opening".  The door and left window have already been mulled together.  As far as I can tell, their top is flat.  I get this error when trying to mull the window/door unit with the top window.  What is the correct way to do this?

Mulled.png

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Thanks to you both.  Turns out the window / door combo were not the same height.  When i created a sample to demo the problem, this time with windows and doors with casings, it become much clearer that there was a height difference.  Checking the actual position would have been a simpler solution.  Newbie mistake.  By the way, what does DBX stand for?

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