Within the framework of a first level support, this field is automatically loaded with a value that is always equal to 1. Indeed, the target is always at level 0. This support only authorizes direct relations with the target and thus is level1. As a consequence, it is not possible to enter a value not equal to 1.
In the case of grouping support, this field is used to indicate the level of a table within the inter-table relationship tree structure.
Level 0 corresponds to the target.
Level 1 corresponds to a table directly linked to the target.
Level 2 corresponds to a table linked to a table in level 1.
Etc…