line: amount darf negativ sein + test, constrain gelöscht

line.py

@@ -91,8 +91,7 @@ class Line(Workflow, ModelSQL, ModelView):
                 STATES['readonly'],
                 Eval('bookingtype', '').in_(['spin', 'spout']),
                 ),
-        }, depends=DEPENDS+['currency_digits', 'bookingtype'],
-        domain=[('amount', '>=', Decimal('0.0'))])
+        }, depends=DEPENDS+['currency_digits', 'bookingtype'])
     debit = fields.Numeric(string='Debit', digits=(16, Eval('currency_digits', 2)),
         required=True, readonly=True, depends=['currency_digits'])
     credit = fields.Numeric(string='Credit', digits=(16, Eval('currency_digits', 2)),
@@ -174,6 +173,13 @@ class Line(Workflow, ModelSQL, ModelView):
 
     #image = fields.Binary...
 
+    @classmethod
+    def __register__(cls, module_name):
+        super(Line, cls).__register__(module_name)
+
+        table = cls.__table_handler__(module_name)
+        table.drop_constraint('amount_val')
+
     @classmethod
     def __setup__(cls):
         super(Line, cls).__setup__()
@@ -184,9 +190,6 @@ class Line(Workflow, ModelSQL, ModelView):
             ('state_val',
                 Check(t, t.state.in_(['edit', 'check', 'done'])),
                 'cashbook.msg_line_wrong_state_value'),
-            ('amount_val',
-                Check(t, t.amount >= Decimal('0.0')),
-                'cashbook.msg_line_must_positive'),
             ])
         cls._transitions |= set((
                 ('edit', 'check'),
@@ -351,11 +354,10 @@ class Line(Workflow, ModelSQL, ModelView):
     def search_rec_name(cls, name, clause):
         """ search in description +...
         """
-        l1 = cls.search_payee(name, clause) + [
+        return cls.search_payee(name, clause) + [
             ('description',) + tuple(clause[1:]),
             ('category.rec_name',) + tuple(clause[1:]),
             ]
-        return l1
 
     def get_rec_name(self, name):
         """ short + name