diff --git a/book.py b/book.py
index 98371c7..3a9b64a 100644
--- a/book.py
+++ b/book.py
@@ -3,14 +3,14 @@
 # The COPYRIGHT file at the top level of this repository contains the
 # full copyright notices and license terms.
 
-from trytond.model import fields
+from trytond.model import fields, SymbolMixin
 from trytond.exceptions import UserError
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval, Or, Len
 from trytond.modules.cashbook.book import STATES2, DEPENDS2
 
 
-class Book(metaclass=PoolMeta):
+class Book(SymbolMixin, metaclass=PoolMeta):
     __name__ = 'cashbook.book'
 
     asset = fields.Many2One(string='Asset',
@@ -53,6 +53,8 @@ class Book(metaclass=PoolMeta):
                     Len(Eval('lines')) > 0,
                 ),
         }, depends=DEPENDS2+['feature', 'lines', 'asset_uomcat'])
+    symbol = fields.Function(fields.Char(string='Symbol', readonly=True),
+        'on_change_with_symbol')
 
     @fields.depends('asset', 'quantity_uom')
     def on_change_asset(self):
@@ -67,6 +69,15 @@ class Book(metaclass=PoolMeta):
         """
         return 4
 
+    @fields.depends('quantity_uom', 'currency')
+    def on_change_with_symbol(self, name=None):
+        """ get symbol for asset
+        """
+        return '%(currency)s/%(unit)s' % {
+            'currency': getattr(self.currency, 'symbol', '-'),
+            'unit': getattr(self.quantity_uom, 'symbol', '-'),
+            }
+
     @fields.depends('asset', '_parent_asset.uom')
     def on_change_with_asset_uomcat(self, name=None):
         """ get uom-category of asset
diff --git a/line.py b/line.py
index 9fbdab6..88b5964 100644
--- a/line.py
+++ b/line.py
@@ -28,14 +28,14 @@ class Line(metaclass=PoolMeta):
         'on_change_with_quantity_digits')
     quantity_uom = fields.Function(fields.Many2One(string='Symbol',
         readonly=True, model_name='product.uom'),
-        'on_change_with_quantity_symbol')
+        'on_change_with_quantity_uom')
     asset_rate = fields.Function(fields.Numeric(string='Rate',
         readonly=True,
         digits=(16, If(
             Eval('currency_digits', 2) > Eval('quantity_digits', 2),
-            Eval('currency_digits', 2), Eval('quantity_digits', 2)))),
+            Eval('currency_digits', 2), Eval('quantity_digits', 2))),
+        depends=['currency_digits', 'quantity_digits']),
         'on_change_with_asset_rate')
-    #asset_ratesymbol = fields.
 
     @fields.depends('quantity', 'amount', 'currency_digits', 'quantity_digits')
     def on_change_with_asset_rate(self, name=None):
@@ -52,8 +52,8 @@ class Line(metaclass=PoolMeta):
                 ).quantize(Decimal(str(1/10**digit)))
 
     @fields.depends('cashbook', '_parent_cashbook.quantity_uom')
-    def on_change_with_quantity_symbol(self, name=None):
-        """ get quantity-symbol of asset
+    def on_change_with_quantity_uom(self, name=None):
+        """ get quantity-unit of asset
         """
         if self.cashbook:
             return self.cashbook.quantity_uom.id
diff --git a/locale/de.po b/locale/de.po
index 2175463..ada411c 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -38,6 +38,10 @@ msgctxt "help:cashbook.book,quantity_uom:"
 msgid "UOM"
 msgstr "Einheit"
 
+msgctxt "field:cashbook.book,symbol:"
+msgid "Symbol"
+msgstr "Symbol"
+
 
 #################
 # cashbook.line #
diff --git a/locale/en.po b/locale/en.po
index ff8880b..9501c48 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -30,6 +30,10 @@ msgctxt "help:cashbook.book,quantity_uom:"
 msgid "UOM"
 msgstr "UOM"
 
+msgctxt "field:cashbook.book,symbol:"
+msgid "Symbol"
+msgstr "Symbol"
+
 msgctxt "field:cashbook.line,quantity_digits:"
 msgid "Digits"
 msgstr "Digits"
diff --git a/tests/test_book.py b/tests/test_book.py
index 660de27..c8899a7 100644
--- a/tests/test_book.py
+++ b/tests/test_book.py
@@ -104,7 +104,8 @@ class CbInvTestCase(CashbookTestCase, InvestmentTestCase):
         self.assertEqual(book.lines[0].amount, Decimal('2.5'))
         self.assertEqual(book.lines[0].quantity, Decimal('1.453'))
         self.assertEqual(book.lines[0].quantity_digits, 3)
-        self.assertEqual(book.lines[0].quantity_symbol, 'u')
+        self.assertEqual(book.lines[0].quantity_uom.symbol, 'u')
+        self.assertEqual(book.symbol, 'usd/u')
 
     @with_transaction()
     def test_assetbook_book_uom(self):
diff --git a/view/line_form.xml b/view/line_form.xml
index 97e9d0b..a135d0b 100644
--- a/view/line_form.xml
+++ b/view/line_form.xml
@@ -8,12 +8,7 @@ full copyright notices and license terms. -->
         <label name="quantity" />
         <field name="quantity" symbol="quantity_uom"/>
         <label name="asset_rate"/>
-        <!--<field name="asset_rate"/>-->
-
-        <group id="asset_rate" col="2">
-            <field name="asset_rate" xexpand="0"/>
-            <field name="number" xalign="0.0" xexpand="0"/>
-        </group>
+        <field name="asset_rate" symbol="cashbook"/>
 
         <field name="quantity_digits"/>
         <newline/>