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Can be an answer here.
extracted from "Challenger 605_650 Pro Line 21 Advanced Flight Management System (FMS) [Entertainment].pdf"
RULES:
The rules that follow are applicable to selection of a STAR and transition.
• When a STAR is selected or changed, if the STAR is not associated with a previously selected approach or runway, the runway or approach selection on the ARRIVAL page is removed.
• When a STAR is selected or changed, and the navigation database does not define the intended path to the waypoint and the waypoint is immediately preceded by a heading leg or a course leg that does not terminate at a fix, the FMS suppresses the waypoint display and removes the associated waypoint’s altitude. This issue can occur for
departure, arrival, approach, and missed approach. For US RNAV operations, manually selecting and inserting individual, named fixes and altitude restrictions from the database will restore the waypoint display.
• If a STAR is re-selected, and a leg of that STAR happens to be active, that leg stays in the flight plan as the active leg, and the legs of the new STAR, which is preceded by a DISCONTINUITY, follow the active leg.
• When the selection of a STAR is changed, this removes the old STAR from the flight plan. The new STAR is inserted in place of the old STAR, unless a leg of the old STAR is active. In that case, the new STAR is inserted after the active waypoint.
• If a previously selected runway is not associated with the newly selected STAR, the runway is removed from the flight plan.
Bons vols
Hervé