I have a custom picker field which is used to select the countries. From the list of all countries the user should not be able to select and save Great Britain and Northern Ireland. Can someone please suggest how I can achieve this.
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In addition to Konduru's approach, you could always add a validation when the user DOES select one of these values. Depending on the use case, this could be preferable sinec it might make more sense to users (as opposed to the option just not appearing, and them not understanding why).