Register product.product so quality_templates field is created there too.

__init__.py

@@ -8,6 +8,7 @@ def register():
     Pool.register(
         ir.Cron,
         production.Template,
+        production.Product,
         production.Production,
         production.ProductionTemplate,
         module='production_quality_control', type_='model')

production.py

@@ -14,6 +14,12 @@ class Template(metaclass=PoolMeta):
         'template', "Quality Templates")
 
 
+# product.product setup must be executed so template's quality_templates field
+# is created to product.product too
+class Product(metaclass=PoolMeta):
+    __name__ = 'product.product'
+
+
 class Production(metaclass=PoolMeta):
     __name__ = 'production'