10.20 'Studio Authoring Guide' mentions at the following pages that user prompts are not supported
in configuring selection lists and filter in the Flow Variables pane. They are not supported?
(page 103) Configuring Selection Lists
Important: In the current version, user prompts are not supported. It is possible to set up
selection lists, in preparation for later versions, where user prompts will be supported, but do
not use them in flows with this version.
(page 220) Filter information in the Flow Variables pane
Note: User prompts are not supported in this version of HP OO.