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  How to understand why a place is impossible?

Impossible places are displayed in grey on the timetable. To find out what makes the placement impossible, position the course matrix (green frame) on the concerned place. If the course is unplaced, the green frame automatically appears on the grid. If the course is already placed, double-click on the course to make it appear.

Once the green frame is positioned on the concerned place, look at the course form:

• the resources occupied by another course are marked in red: to find out what is occupying the resource in red, select it, right click and choose View the problematic courses.

• the constraints that affect this time slot are indicated by symbols: move the cursor over them to display the caption in a tooltip.