The relations between objects are calculated according to their positions on the synoptic:


  1. Select a shape in the library


  1. Drop the control box in an entity: The suffix "2E" of the control box is correct


  1. Move the control box outside the entity: The suffix is now linked to the PLC


  1. Select Standard toolbar and click on "Activate 'center of gravity" bullet" 


  1. Move the bullet into the entity: The suffix is correct again, the control box belong to the entity

Some shapes have an anchor point to fix the center of gravity bullet (Usually in the upper right corner of the shape)