@rikdegraaf– This is currently not something that Piklist does. You would probably have to write some custom JS / AJAX to get this working.
HOWEVER…
I’ve done something like this with Piklist Workflow tabs. In Tab 1 the user selects the Post, and then in Tab 2 you can populate the data. The reason you can do that is because the data is saved in Tab 1, and then the page reloads for Tab 2.
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