diff --git a/equipment_manage.php b/equipment_manage.php
index 9379e71..1f798a5 100644
--- a/equipment_manage.php
+++ b/equipment_manage.php
@@ -161,7 +161,7 @@ $view .= '<div class="content-block tab-content active">
                     <option value="5" '.($equipment['status']==5?' selected':'').'>'.$status5_text .'</option>
                 </select>
                 <label for="productrowid">'.$equipment_label4.'</label>
-                <select id="productrowid" name="productrowid">
+                <select id="productrowid" name="productrowid" '.($update_allowed_special==0? 'readonly':'').'>
                 '.$product_option_list.'
                 </select>
                 <label for="serialnumber">'.$equipment_label2.'</label>