We have content model which has one to many relation between product and countries in which it is available
Country is represented using separate content type having 2 unique fields - name and iso2
Product content type has field called availableCountries which is an array of items with allowed item type Country
Currently when editor is creating product he is able to select same country more than once, is there a way we can restrict editor to not select same country which is already selected and associated with current entry ?
Appreciate if someone can suggest any options or pointers?