Get input from parent view to an inline action

[appsheet_esn]

Let's say we have 2 tables, Events (key: eventID) and Registrations (key: regID).

In the table Events, there is a reference column (inline view) of its registrations. That means on the detail page of each event, its participants are shown as a table list.

I want to add an action button (inline for each registration record) to remove the entry which corresponds to the current event shown on the screen.

Since a person can participate to many events, how can i indicate which record of the table Registrations (regID) should be deleted/edited based on the Event (eventID) current shown?

Is there a way i can get the values from the current parent screen from an inline view?

[Thagu]

I've the same issue. No solution known so far? Thank you