How to set a value in a field from sc_item_option_mtom table

Hi,

Im trying to populated the field 'Return Date' from specific catalog item variable but the field is not populated.
What am I doing wrong?

var dt = new GlideRecord('sc_item_option_mtom');
dt.addEncodedQuery('request_item.number=' + current.request_item + '^sc_item_option.item_option_new=4a5677081b8a5510aeb37739cd4bcbeb')
dt.query();
if (dt.next()) {
dt.setValue('u_return_date', dt.getValue('Value'));
dt.update();
}