diff --git a/book.py b/book.py
index 332d514..2858b37 100644
--- a/book.py
+++ b/book.py
@@ -152,16 +152,15 @@ class Book(SymbolMixin, metaclass=PoolMeta):
         return 4
 
     @classmethod
-    def get_asset_quantity(cls, cashbooks, names):
-        """ get quantities
-    """
+    def get_asset_quantity_sql(cls):
+        """ get table of asset and its value, rate, ...
+        """
         pool = Pool()
         CBook = pool.get('cashbook.book')
         BookType = pool.get('cashbook.type')
         Line = pool.get('cashbook.line')
         Asset = pool.get('investment.asset')
         Currency = pool.get('currency.currency')
-        Uom = pool.get('product.uom')
         tab_book = CBook.__table__()
         tab_type = BookType.__table__()
         tab_line = Line.__table__()
@@ -169,13 +168,9 @@ class Book(SymbolMixin, metaclass=PoolMeta):
         tab_asset = Asset.__table__()
         (tab_rate, tab2) = Asset.get_rate_data_sql()
         (tab_balance, tab2) = CBook.get_balance_of_cashbook_sql()
-        cursor = Transaction().connection.cursor()
         context = Transaction().context
 
-        result = {x:{y.id: None for y in cashbooks} for x in names}
         query_date = context.get('qdate', CurrentDate())
-        company_currency = CBook.default_currency()
-
         query = tab_book.join(tab_line,
                 condition=(tab_book.id==tab_line.cashbook),
             ).join(tab_type,
@@ -209,9 +204,27 @@ class Book(SymbolMixin, metaclass=PoolMeta):
                     tab_book.currency, tab_cur.digits, tab_asset.uom,
                     tab_book.quantity_uom, tab_asset.currency,
                     tab_balance.balance],
-                where=tab_book.id.in_([x.id for x in cashbooks]) & \
-                    (tab_type.feature == 'asset'),
+                where=(tab_type.feature == 'asset'),
             )
+        return (query, tab_book)
+
+    @classmethod
+    def get_asset_quantity(cls, cashbooks, names):
+        """ get quantities
+        """
+        pool = Pool()
+        CBook = pool.get('cashbook.book')
+        Uom = pool.get('product.uom')
+        Currency = pool.get('currency.currency')
+        cursor = Transaction().connection.cursor()
+        context = Transaction().context
+        (query, tab_book) = cls.get_asset_quantity_sql()
+
+        result = {x:{y.id: None for y in cashbooks} for x in names}
+        company_currency = CBook.default_currency()
+
+        query.where &= tab_book.id.in_([x.id for x in cashbooks]) & \
+            (tab_book.btype != None)
         cursor.execute(*query)
         records = cursor.fetchall()