Does not work, why ? (custom code on FORM)

The following works:
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else if (name == 'custrecord_commuter_student')
    {
        var recordID = nlapiGetFieldValue('custrecord_commuter_student');
        var record = nlapiLoadRecord('customer',recordID);
        var addressbookCountry = record.getLineItemValue('addressbook','country',1);
        nlapiSetFieldValue('custrecord_commuter_country', addressbookCountry);
    }


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But I changed the RED to the following, but it does not work. WHY?
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else if (name == 'custrecord_commuter_student')
    {
        var recordID = nlapiGetFieldValue('custrecord_commuter_student');
        var record = nlapiLoadRecord('customer',recordID);
        var addressbookCountry = record.getLineItemText('addressbook','country',1);
        nlapiSetFieldValue('custrecord_commuter_country', addressbookCountry);
    }