How to display custom validation message in Constellation?

General
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In my Constellation app, I’m validating two fields in the Request Data Transform before triggering the TFI API. The validation works, but instead of showing our custom error, the UI displays a generic “Data view has message error” — how can I display a clear custom message to the user?

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@Sindhusha Seelam

To show a custom validation message in a Constellation app, you should add the error message directly to the field you are validating, not at the page or data view level. In your Request Data Transform, use the “Add Message” action on the specific field like .FieldA or .FieldB where the error should show. This helps the UI display the exact message next to the field. Avoid adding messages on read-only data pages or using general page-level messages, as Constellation will then show a generic “Data view has message error.” If you want to show a banner message at the top, you can add the message to pyCaseMessages() on the main case page. This way, users will clearly see your custom message instead of the generic error

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@Sairohith Could you please elaborate on showing a business warning on a banner message. I didn’t find any references or rules for

pyCaseMessages()
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@Sindhusha Seelam

Please check this post - Custom error message for required field in Constellation (Pega v24.2.2) | Pega Community

I hope this helps!