Compart By Path Active Entity has no Sketch CrossSection Object.
Compart By Path Active Entity does not have a Cross Section. The Cross Section is one of the inputs to the CompartByPathAE to place a volume along a path. The Cross Section will be one of two types: 1) a Visual Basic symbol with parameters controlled from the catalog, or 2) Sketch 3D, controlled using the Profile Sketch.
Coding or data model errors.
Modification of the cross section attributes (such as dimensions) is not possible.
What You Should Do
In the Workspace Explorer, you can select the corresponding Compart object, and then assign a new cross section type to the object on the modification ribbon.
Open a session.
Select the object in the Workspace Explorer or in a graphic view.
On the ribbon, in the Cross-Section box, select a new cross section to assign to the object.