Phone Type Field Read Only on Employee Self Service section

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Hello all,

I need help to make "read only" the field phone type (in the Employee Self Service section) when this is related to Work Phone. I see some posts related to make read only the work phone number and the work delete button and I understand from these posts that it is possible using the following EL Expression:

#{row.bindings.PhoneType.selectedValue.lookupCode=='W1'}

I tried to use the same expression for the phone type field but it doesn't work. Have anyone encountered the same issue?

Attached the screeshot

Thanks

Valeria