diff --git a/book.py b/book.py
index 65f0839..8390766 100644
--- a/book.py
+++ b/book.py
@@ -3,8 +3,7 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.model import ModelSQL, fields
-from trytond.transaction import Transaction
-from trytond.pool import Pool, PoolMeta
+from trytond.pool import PoolMeta
 
 
 class Cashbook(metaclass=PoolMeta):
diff --git a/category.py b/category.py
index 06160cc..c5fa3a8 100644
--- a/category.py
+++ b/category.py
@@ -23,6 +23,10 @@ class Category(tree(separator=' / '), ModelSQL, ModelView):
     left = fields.Integer(string='Left', required=True, select=True)
     right = fields.Integer(string='Right', required=True, select=True)
 
+    cashbooks = fields.Many2Many(string='Cashbooks',
+        relation_name='cashbook.bookcategory-rel',
+        origin='category', target='cashbook')
+
     @classmethod
     def __setup__(cls):
         super(Category, cls).__setup__()
diff --git a/locale/de.po b/locale/de.po
index 2372d4e..94fce9d 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -54,6 +54,10 @@ msgctxt "view:cashbook.bookcategory:"
 msgid "General Information"
 msgstr "Allgemein"
 
+msgctxt "view:cashbook.bookcategory:"
+msgid "Cashbooks"
+msgstr "Kassenbücher"
+
 msgctxt "field:cashbook.bookcategory,name:"
 msgid "Name"
 msgstr "Name"
@@ -78,6 +82,10 @@ msgctxt "field:cashbook.bookcategory,right:"
 msgid "Right"
 msgstr "Rechts"
 
+msgctxt "field:cashbook.bookcategory,cashbooks:"
+msgid "Cashbooks"
+msgstr "Kassenbücher"
+
 
 #################
 # cashbook.book #
diff --git a/locale/en.po b/locale/en.po
index 97cfcf1..7374def 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -38,6 +38,10 @@ msgctxt "view:cashbook.bookcategory:"
 msgid "General Information"
 msgstr "General Information"
 
+msgctxt "view:cashbook.bookcategory:"
+msgid "Cashbooks"
+msgstr "Cashbooks"
+
 msgctxt "field:cashbook.bookcategory,name:"
 msgid "Name"
 msgstr "Name"
@@ -62,6 +66,10 @@ msgctxt "field:cashbook.bookcategory,right:"
 msgid "Right"
 msgstr "Right"
 
+msgctxt "field:cashbook.bookcategory,cashbooks:"
+msgid "Cashbooks"
+msgstr "Cashbooks"
+
 msgctxt "view:cashbook.book:"
 msgid "Categories"
 msgstr "Categories"
diff --git a/tests/test_category.py b/tests/test_category.py
index 9677d39..6ec3c31 100644
--- a/tests/test_category.py
+++ b/tests/test_category.py
@@ -78,6 +78,9 @@ class CategoryTestCase(CashbookTestCase):
             self.assertEqual(len(book.categories), 1)
             self.assertEqual(book.categories[0].rec_name, 'Cat 0')
 
+            self.assertEqual(len(category.cashbooks), 1)
+            self.assertEqual(category.cashbooks[0].rec_name, 'Book 1 | 0.00 usd | Open')
+
             # replace category
             Book.write(*[
                 [book],
diff --git a/view/category_form.xml b/view/category_form.xml
index 5366dfc..2d6d58d 100644
--- a/view/category_form.xml
+++ b/view/category_form.xml
@@ -12,6 +12,9 @@ full copyright notices and license terms. -->
             <field name="parent"/>
             <field name="childs" colspan="4"/>
         </page>
+        <page string="Cashbooks" name="cashbooks" col="1">
+            <field name="cashbooks"/>
+        </page>
     </notebook>
     <field name="company" invisible="1"/>