What if you have entity level validation rule and want to attach validation error message to specific field. By default this is not possible - all entity level validation error messages are displayed in the popup and are not attached to the fields (differently than attribute level validation rule messages).
Apparently there is a way to achieve such requirement with Groovy expression, this can be executed from entity level validation - adf.error.addAttribute('Salary'). In addAttribute you need to provide attribute name which will be assigned with the error. Complete expression for entity validator:
Result displayed on UI - validation error message is assigned to the field, which was changed: Read the complete article here.
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