This is the technical support forum for Toolset - a suite of plugins for developing WordPress sites without writing PHP.
Everyone can read this forum, but only Toolset clients can post in it. Toolset support works 6 days per week, 19 hours per day.
The issue here is that the user wanted to filter their parent view by the child post custom field.
Unfortunately no this is not possible. You can only filter a post view based on the values that are on the post that the view is displaying.