If you want to display a user interface form in the user interface depending on the particular object selected, you must assign the form to the valid object definition.
To assign a user interface form to an object definition
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In the Designer, select the User interface > Forms > User interface forms category.
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Select the Edit form task.
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In the Form Editor, select the user interface form.
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In the edit view, select the Object assignment view and select the object definition.
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Select the Database > Commit to database and click Save.