Works here, ArchiCAD 13, both via Trim to Roof and Solid Element Operations. If the roof edge and wall edge are aligned, and the wall surface and roof edge have the same material, I don't see why it would not work.
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David
David Maudlin / Architect www.davidmaudlin.com Digital Architecture AC27 USA • iMac 27" 4.0GHz Quad-core i7 OSX11 | 24 gb ram • MacBook Pro M3 Pro | 36 gb ram OSX14