add field 'target' for category/cashbook in list view

planner.py

@@ -148,6 +148,9 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
     wfcheck = fields.Boolean(
         string="Set to 'Checked'",
         help="Switches the booking to the 'Verified' state.")
+    booking_target = fields.Function(fields.Reference(
+        string='Target', selection='get_booking_modelnames', readonly=True),
+        'on_change_with_booking_target')
 
     @classmethod
     def __setup__(cls):
@@ -249,6 +252,38 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
                 break
         return result
 
+    @classmethod
+    def get_booking_modelnames(cls):
+        """ get list of model for field 'booking_target
+
+        Returns:
+            list: list of tuple: (model_name, Description)
+        """
+        Model = Pool().get('ir.model')
+        return [
+            (x.model, x.name)
+            for x in Model.search([
+                ('model', 'in', ['cashbook.book', 'cashbook.category'])])]
+
+    @fields.depends('bookingtype', 'category', 'booktransf')
+    def on_change_with_booking_target(self, name=None):
+        """ get category of target-cashbook
+
+        Args:
+            name (str, optional): name of field. Defaults to None.
+
+        Returns:
+            tuple: tuple with model-name and id of booking-target
+        """
+        if self.bookingtype in ['in', 'out']:
+            if self.category:
+                return '%s,%d' % (
+                    self.category.__name__, self.category.id)
+        elif self.bookingtype in ['mvin', 'mvout']:
+            if self.booktransf:
+                return '%s,%d' % (
+                    self.booktransf.__name__, self.booktransf.id)
+
     @fields.depends('cashbook', '_parent_cashbook.currency')
     def on_change_with_currency_cashbook(self, name=None):
         """ get currency of selected cashbook