erp5_advanced_ecommerce: custom reference

bt5/erp5_advanced_ecommerce/SkinTemplateItem/portal_skins/erp5_advanced_ecommerce/WebSection_persistShoppingCart.py

@@ -7,7 +7,8 @@ new_id = context.portal_ids.generateNewLengthId(
 
 random_min = 100000  # 9 digits
 random_max = 1000000  # 10 digits
-reference = "SO-%s-%s" % (new_id, random.randint(random_min,random_max))
+if not reference:
+  reference = "SO-%s-%s" % (new_id, random.randint(random_min,random_max))
 shopping_cart.setReference(reference)
 
 portal_type = shopping_cart.getPortalType()

bt5/erp5_advanced_ecommerce/SkinTemplateItem/portal_skins/erp5_advanced_ecommerce/WebSection_persistShoppingCart.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>shopping_cart, person</string> </value>
+            <value> <string>shopping_cart, person, reference=None</string> </value>
         </item>
         <item>
             <key> <string>_proxy_roles</string> </key>