Webcon 2023.1.3. Validation of off-source data in Choice field

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Dear Agnieszka,
just checked this setting on dev environment (Standalone / portal version 2023.1.3.169) and it worked as expected.
Didn't set the value on Choice field (field set as visible and required) and proceeded with path "Save draft", where attribute validation is not set. Element was proceeded without any error.
Attaching screenshot (in PL) with settings.

Best.

Thank you for the tip, but the problem occurs when the field is with behavior: Popup search window
I cannot use Dropdawn because I load some of the values ​​into other fields.
Attaching screenshot.

Dear Agnieszka,
have you tried settings in "Picker" tab? Attached example. But still if form validation on path is not set on then it should work.

Yes, I tried, it work only if user click 'pencil' next to the attribute, without any intervention by the user it not work,
form validation on path is not set on.

Dear Agnieszka,
now I get your point. :)
Can't tell you about JavaScripts here. Also not sure if this is a good option in your process but maybe setting a default value or setting a value like 'Other' (included in source for this choice field) in this case could be useful somehow. Until user will have to select a valid value for this field (on next steps?). That way you can validate this field at later steps.