Thanks for passing this along. I’ll document and send along to the product devs.
There might be a workaround.
1. Make the option source for the reference field be a model (Call it model X).
2. Add a model action that fires when the the client field is updated.
3. This action should pass value into a condition on Model X and the requery it.
Finally, you may have to refresh the editor that shows the picklist field - and this would take some javascript.
Hope that gets the ideas flowing…
