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Unlike the generic Sub Form element found in the community edition, AJAX Sub Form gives you the flexibility of dynamically populating a subform as the value it watches changes.
The example below shows how the AJAX Sub Form changes its content depending on the field value it's tied to.
Figure 1: Configuration of AJAX Sub Form Element
Figure 2: AJAX Sub Form Element Tied to Multi-Select Form Element
Figure 3: Content Change in AJAX Sub Form During Field Value Change
Please note that the value of the dependent field (campaign in example above) must be the id/primary key of the record to load with Ajax Sub Form.