>The relation is set into the dataenvironmet
>
>How can I remove the relation and then restore it ?
You can click on the relation and press delete. To restore the relation, you can drag a field to an index tag (?) with the mouse.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)