Displaying the height of default reference planes
The height of the lower and upper default reference planes is displayed as follows in the dialog box:

- A: the height of the associated default reference planes is displayed beside the relevant structural level.
- B: when a drawing file adopts the height of the default reference planes from the superordinate structural level, nothing is displayed.
- C: when the height of the default reference planes in a drawing file differs from the height assigned to the superordinate structural level, the height is displayed in blue.
- D: when a drawing file does not adopt its default reference planes from the plane model, "-" is displayed.
- E: if the default reference planes assigned to a drawing file are not available, "?" is displayed (for example, when you delete the planes from the plane model later).
When you move the cursor over a height displayed, the ToolTip shows the name of the plane model, pair of reference planes and of the default reference plane.