Index: branches/version-2_12-dev/html/js/products.js
===================================================================
--- branches/version-2_12-dev/html/js/products.js	(revision 21534)
+++ branches/version-2_12-dev/html/js/products.js	(revision 21893)
@@ -8,4 +8,9 @@
                       var $sele2 = $form.find('select[name=classcategory_id2]');
                       setClassCategories($form, product_id, $sele1, $sele2);
+
+                      // 規格1のみの場合
+                      if ($sele2.val() == undefined) {
+                          checkStock($form, product_id, $sele1.val(), '0');
+                      }
                   });