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I have a lot of taxonomy terms that need to be categorized into multiple categories and subcategories:

- AAA
  - BBB
    - CCC
    - DDD
    - EEE
...

Is there a way how to restrict assigning higher terms to nodes (AAA, BBB) and allow to use only lowest terms (without any child terms - CCC, DDD, EEE)?

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Hierarchical Select.

Hierarchical Select has the ability to save the entire lineage of a selection or only the "deepest" selection. You can configure it to force the user to make a selection as deep as possible in the tree, or allow the user to select an item anywhere in the tree. Levels can be labeled, you can configure limit the number of items that can be selected, configure a title for the dropbox, choose a site-wide animation delay, and so on. You can even create new items and levels through Hierarchical Select!

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  • Nice... change the widget of term reference field type in content type to Hierarchical select and set appropriate settings.
    – Axel Stone
    Apr 22, 2015 at 17:41

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