Solved. I dont' know exactly what was wrong, although it was most
probably in the callback function.
Maybe the carriage returns.

But this works fine:

$.ajax({
    async: false,
    url: cart_doc,
    type: 'POST',
    data: {action: 'retrieve_opt', name: fieldName},
    dataType: 'text',
    timeout: 1000,
    error: function(){
        alert('Error retrieving product option value');
    },
    success: function(chosenOption) {
      field.value=chosenOption;
      alert(field.value);
    }
});

Bye.

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