Ho to make a read only / disabled input text mandatory?

Hi All,
I'm using ADF to display data for a human task. Part of my requirement is to display a payload attribute as an output text/ read only input text. If this is null, the form should compel the user to choose from a list of values.
How do I make an output text mandatory? Is there another way around this?
I tried creating an input text and making it read only and mandatory, this doesn't work. Apparently, you cant make a disabled/read only input text mandatory?
JDev : 11.1.1.4
Thanks
PP

Hello! What does mandatory field mean for you? If there should be validation while saving, it will be: faces message will be shown with text, as it is defined in business rules in entity object. If you just wish to see blue “*” in front of label, just use “panelLabelAndMessage” component with “showRequired” property = “true”. If you wish to see some red frame around disabled field or button, if it has null value, I don’t know how to help you, but wish to know how to do that too.

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