Insert a larger Wall Opening and measure it.
Or, create a curtain type with the "10 mm shim" as the border frame, no divisions. Insert it in the wall and set the size = the rough opening. Nest the original Curtain wall in it as the panel.
Similar topic: https://forums.autodesk.com/t5/revit-architecture-forum/challenge-extended-dimension-reference-built...
Toan Nguyen
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