1.1 --- a/imiptools/editing.py	Mon Dec 11 00:32:37 2017 +0100
     1.2 +++ b/imiptools/editing.py	Mon Dec 11 22:09:38 2017 +0100
     1.3 @@ -1421,6 +1421,8 @@
     1.4      # incremental updates.
     1.5  
     1.6      cancelled_removed = select_recurrences(cancelled, removed).values()
     1.7 +    cancelled_main = get_main_period(cancelled_removed)
     1.8 +    cancelled_main = cancelled_main and [cancelled_main] or []
     1.9  
    1.10      # Reinstated periods are previously-cancelled periods that are now modified
    1.11      # periods, and they appear in updates.
    1.12 @@ -1463,7 +1465,7 @@
    1.13  
    1.14          if not is_shared or new and not replaced:
    1.15              to_set = active_non_rule
    1.16 -            to_exclude = list(chain(cancelled_rule, obsolete_rule))
    1.17 +            to_exclude = list(chain(cancelled_rule, obsolete_rule, cancelled_main))
    1.18              to_unschedule = []
    1.19              to_reschedule = []
    1.20              to_add = []
    1.21 @@ -1504,7 +1506,7 @@
    1.22  
    1.23          else:
    1.24              to_set = active_non_rule
    1.25 -            to_exclude = list(chain(cancelled, obsolete_rule))
    1.26 +            to_exclude = list(chain(cancelled, obsolete_rule, cancelled_main))
    1.27              to_reschedule = []
    1.28              all_unscheduled = []
    1.29              all_rescheduled = []