Parasolids have stricter rules on valid geometry than version 8 models. If an operation fails when using a Parasolid, the Operation Fault Report dialog is displayed; it contains information to help identify the areas of a model that are causing problems:
Use the options on the dialog to identify the area that requires attention:
— Select which problem areas to display. Select this option to show all areas. Deselect this option to show only the currently selected areas.
— Select whether to display faces.
— Select whether to display curves.
— Select whether to display vertices.
Create geometry — Select this option to create geometry for each displayed problem area.
Use the Solid Doctor to view and fix faults in a Parasolid body. You must fix a fault only if you are going to perform a modelling operation through the faulty area; for example, performing a Boolean subtraction.