slapos_subscription_request: factorize to create Subscription Change Request

master/bt5/slapos_subscription_request/SkinTemplateItem/portal_skins/slapos_subscription_request/Resource_createSubscriptionRequest.py

@@ -110,8 +110,8 @@ else:
   if not price:
     raise AssertionError('Can not find a price to generate the Subscription Request (%s)' % tmp_sale_order.getSpecialiseValue())
 
-subscription_request = portal.subscription_request_module.newContent(
-  portal_type='Subscription Request',
+subscription_request = portal.getDefaultModuleValue(portal_type).newContent(
+  portal_type=portal_type,
   temp_object=temp_object,
   destination_value=subscriber_person_value,
   # Do not set a default destination section if it is not defined on a trade condition

master/bt5/slapos_subscription_request/SkinTemplateItem/portal_skins/slapos_subscription_request/Resource_createSubscriptionRequest.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>subscriber_person_value, variation_category_list, project_value, currency_value=None, default_price=None, temp_object=False</string> </value>
+            <value> <string>subscriber_person_value, variation_category_list, project_value, currency_value=None, default_price=None, temp_object=False, portal_type=\'Subscription Request\'</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>