Hi there,
I also experienced the same issue. There is a bug in Prestashop (at least here with 1.6.1).
In classes/Customization.php :
public function getWsCustomizedDataTextFields() { if (!$results = Db::getInstance()->executeS(' SELECT id_customization_field, value FROM `'._DB_PREFIX_.'customization_field` cf LEFT JOIN `'._DB_PREFIX_.'customized_data` cd ON (cf.id_customization_field = cd.index) WHERE `id_product` = '.(int)$this->id_product.' AND cd.id_customization = '.(int)$this->id.' /* HERE IS THE MISSING PART */ AND cf.type = 1')) { return array(); } return $results; }
If you use customized data images, you have to also fix getWsCustomizedDataImages