1. Set Constraint at Generate Options

Diagram 1.1 Location of Invigilator Position in Generate options
Click Generate Option tab and then click Invigilator Position to set Invigilator Position Constraint.

Diagram 1.2 Invigilator Position Window
1. Invigilator Positions

Diagram 1.3 Invigilator Positions
2. Defined Positions

Diagram 1.4 Defined Positions
3. Auto Assign Position

Diagram 1.5 Auto Assign Position
IMPORTANT NOTE: Invigilator that are already locked usually the ones that are confirm to be invigilating the examinations.