book:caching for line, settings: cache clear

assetsetting.py

@@ -21,4 +21,13 @@ class AssetSetting(ModelSingleton, ModelSQL, ModelView):
         model_name='cashbook.book', ondelete='RESTRICT',
         help='Profit and loss on sale of assets are recorded in the cash book.')
 
+    @classmethod
+    def write(cls, *args):
+        """ clear cache-values
+        """
+        MemCache = Pool().get('cashbook.memcache')
+
+        MemCache._cashbook_value_cache.clear_all()
+        super(AssetSetting, cls).write(*args)
+
 # end AssetSetting