Cause

A planning object created in the pre-planning navigator has not yet been placed in the "Pre-planning" representation type.

Solution

1. Open the page of the "Pre-planning" type on which the planning object is to be placed.
2. Open the pre-planning navigator (command path: Tab Pre-planning > Command group General > Navigator).
3. Mark the message in the Message management dialog and select the popup menu item Synchronize selection.
   
   The respective planning object is marked in the pre-planning navigator.
4. Select the Place popup menu item in the pre-planning navigator.
   
   A symbol for a black box is shown at the cursor.
5. Click the left mouse button.
6. Drag open a rectangle that represents that box as a planning object.
7. Click the left mouse button again.
   
   The planning object is placed.
8. If required, start a new check run.