May I ask, if you took a look at the linked chart?
The transition contains the following waypoints (in this specific order): ROKIL, DM421, DM422, DM423, DM424, DM425, DM426, DM427, DM428, DM429, (VECTORS)
What is entered in the FMC by selecting this transition is: ROKIL, DM421, DM425(FL80A), DM429, (VECTORS)
Automaticly entering these 5 waypoints only by selecting the transition is according to the standard, which is defined by the coding table of Eurocontrol and reflects the real world. Any other direct to a waypoint which is part of the transition but not entered due to the coding table (let me call it restriction) is unable to fly, because you can't enter it. These waypoints are often used in real world.
BTW, it was/is possible in the NGX.