New field 'move_event' for moving occurence-date if not a business day

planner.py

@@ -34,6 +34,11 @@ SEL_WEEKDAY = [
     ('0', 'Monday'), ('1', 'Tuesday'), ('2', 'Wednesday'),
     ('3', 'Thursday'), ('4', 'Friday'), ('5', 'Saturday'),
     ('6', 'Sunday')]
+SEL_MOVE_EVENT = [
+    ('nop', 'unchanged'),
+    ('before', 'Business day before original date'),
+    ('after', 'Business day after original date')
+]
 
 
 class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
@@ -101,6 +106,10 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
     nextrun_date = fields.Function(fields.Date(
         string='Next Execution Date', readonly=True),
         'on_change_with_nextrun_date', searcher='search_nextrun_date')
+    move_event = fields.Selection(
+        string='If no business day', required=True, selection=SEL_MOVE_EVENT,
+        help='If the date of execution falls on a weekend or holiday, ' +
+        'it can be moved to a business day.')
 
     bookingtype = fields.Selection(
         string='Type', selection=sel_bookingtype, required=True,
@@ -442,6 +451,16 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
         """
         return [('nextrun.date',) + tuple(clause[1:])]
 
+    @classmethod
+    def default_move_event(cls):
+        """ 'no operation' as default for
+            business-day occurence
+
+        Returns:
+            str: nop
+        """
+        return 'nop'
+
     @classmethod
     def default_wfcheck(cls):
         """ False as default for wf-state 'checked'