When ‘Insert/Update action will be followed strictly’ is selected, ILIAS ignores an action, if it can not be performed (e. g. an ‘Insert’ action is not done, if there already is a user with the same login in the database.) When ‘Insert/Update action will be detected automatically’ is selected, ILIAS may update the database if an action can not be performed otherwise. (e. g. an ‘Insert’ action is replaced by an ‘Update’ action and the other way around, if a user with the same login exists in the database).