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Use the below EL Expression to make the country code required.
#{row.bindings.PhoneType.selectedValue.lookupCode=='W1'}
Note: this expression is referencing the Lookup Code, not the Lookup Meaning that is displayed on the UI. So, in the above example, 'W1' refers to 'Work Phone'. You will need to look at the PHONE_TYPE lookup to see what the lookup code is for 'Work Extension'. Also, be sure that you are using the 'Required' property, not the 'Show Required' property.
I hope this blog post was helpful for you. If you have any questions or feedback, please leave a comment below.