TMSS-2947: change project category filter to single choice filter to work around bug

SAS/TMSS/backend/src/tmss/workflowapp/viewsets/schedulingunitflow.py

@@ -117,8 +117,8 @@ class SchedulingUnitTaskFilter(property_filters.PropertyFilterSet):
     owner_username = filters.CharFilter(field_name='owner__username', lookup_expr='icontains')
     owner_username_isnull = filters.BooleanFilter(label='owner_username [isnull]', field_name='owner__username', lookup_expr='isnull')
     project_name = property_filters.PropertyCharFilter(field_name='project__name', lookup_expr='icontains')
-    project_category = property_filters.PropertyMultipleChoiceFilter(label='project category [any]', field_name='project__project_category', choices=[(c.value, c.value) for c in ProjectCategory.Choices])
-    scheduling_unit_status = filters.MultipleChoiceFilter(label='scheduling unit status [any]', field_name='process__schedulingunitprocess__su__status', choices=[(c.value, c.value) for c in SchedulingUnitStatus.Choices])
+    project_category = property_filters.PropertyChoiceFilter(label='project category', field_name='project__project_category', choices=[(c.value, c.value) for c in ProjectCategory.Choices])
+    scheduling_unit_status = filters.MultipleChoiceFilter(label='scheduling unit status [any]', field_name='process__schedulingunitprocess__su__status', choices=[(c.value, c.value) for c in SchedulingUnitStatus.Choices], lookup_expr='iexact')
     scheduling_unit_id = NumberInFilter(field_name='process__schedulingunitprocess__su__id', lookup_expr='in')
     scheduling_unit_name = filters.CharFilter(field_name='process__schedulingunitprocess__su__name', lookup_expr='icontains')