I could not get this working. Checked all the comments and documentation. Followed the instructions but it still did not work. This was a link between 3 dropdowns - Zone -> Region -> Office. Then a Ureka moment. I had the Zone-Region link first and the Region-Office second. with just the Region-Office link it worked fine. So I swapped the order of links to Region-Office then Zone-Region and BINGO! It worked just fine. So try this if you get stuck.
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