[Family] is not upper bounded by a roof, ceiling or floor element. This can result in incorrect adjacencies and voids in the analytical model. Please ensure that Upper Limit and Limit Offset for [Room] is set correctly. 
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
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