Function convert_derived_entry_to_explicit 

fn convert_derived_entry_to_explicit(
    msg: On<'_, '_, ConvertDerivedEntryToExplicit>,
    commands: Commands<'_, '_>,
    parent_q: Query<'_, '_, &ChildOf>,
    schedule_q: Query<'_, '_, &TripSchedule, With<Trip>>,
    nominal_q: Query<'_, '_, &mut TripNominalSchedule, With<Trip>>,
)