I have added some fields to the user interface (UI) and marked those fields as required. The UI that includes these fields has been merged with another UI. This combined UI is then linked to another UI that contains a "save" button. In the "save" button, I have set the validation parameter to true. However, after clicking the save button, the validation for the required fields is not being displayed.
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By any chance, have you included validation groups on your interface or child interfaces anywhere?
No I did not include any validation group but I include some validation to the decimal field like below figure.