book, line, category, types: berechtigung für company-user + test,

book: währung neu,
line: buchungstyp, betrag, credit, debit, währung, sortierung

book.py

@@ -4,10 +4,11 @@
 # full copyright notices and license terms.
 
 from trytond.model import Workflow, ModelView, ModelSQL, fields, Check
-from trytond.pyson import Eval
+from trytond.pyson import Eval, Or, Bool
 from trytond.exceptions import UserError
 from trytond.i18n import gettext
 from trytond.transaction import Transaction
+from trytond.pool import Pool
 
 
 STATES = {
@@ -26,6 +27,8 @@ class Book(Workflow, ModelSQL, ModelView):
     'Cashbook'
     __name__ = 'cashbook.book'
 
+    company = fields.Many2One(string='Company', model_name='company.company',
+        required=True, ondelete="RESTRICT")
     name = fields.Char(string='Name', required=True,
         states=STATES, depends=DEPENDS)
     btype = fields.Many2One(string='Type', required=True,
@@ -45,6 +48,14 @@ class Book(Workflow, ModelSQL, ModelView):
     account = fields.Many2One(string='Account', select=True,
         model_name='account.account', ondelete='RESTRICT',
         states=STATES, depends=DEPENDS)
+    currency = fields.Many2One(string='Currency', required=True,
+        model_name='currency.currency',
+        states={
+            'readonly': Or(
+                STATES['readonly'],
+                Bool(Eval('lines', [])),
+                ),
+        }, depends=DEPENDS+['lines'])
     state = fields.Selection(string='State', required=True,
         readonly=True, selection=sel_state_book)
     state_string = state.translated('state')
@@ -79,6 +90,22 @@ class Book(Workflow, ModelSQL, ModelView):
                 },
             })
 
+    @classmethod
+    def default_currency(cls):
+        """ currency of company
+        """
+        Company = Pool().get('company.company')
+
+        company = cls.default_company()
+        if company:
+            company = Company(company)
+            if company.currency:
+                return company.currency.id
+
+    @staticmethod
+    def default_company():
+        return Transaction().context.get('company') or None
+
     @classmethod
     def default_state(cls):
         return 'open'