Selecting an Optional Field in Tour Hierarchy-in Transportation Cockpit

Hi,

When i open the Settings of Tour Hierarchy in Transportation Cockpit via the button (see pic 1) and select an optional field and press Ok button (see pic 2), it dumps (see pic 3). But this happens only once in maybe 20 times, very seldom.

Has anyone faced a similar issue in Transportation Cockpit? Do you know any snote to be able to solve this problem?

Thanks in Advance.

pic-01.png