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## 18.5.8.4.7 Validation Errors Display as APEX Errors Automatically

Learn about the display of validation errors.

When an end user saves changes to a page, any region based on a BOSS REST Data Source will automatically report any validation errors as an APEX error. The user therefore sees validation failures raised by server-side business object validation rules or triggers in the same, familar way they are used to seeing error messages defined inside the APEX application itself. Multiple error messages will each appear on a new line in the APEX error message.

Parent topic: BOSS REST Data Source Runtime Features