diff --git a/hb_server/apps/wpm/serializers.py b/hb_server/apps/wpm/serializers.py
index aab801d..911d318 100644
--- a/hb_server/apps/wpm/serializers.py
+++ b/hb_server/apps/wpm/serializers.py
@@ -287,14 +287,16 @@ class OperationListSerializer(serializers.ModelSerializer):
                   'subproduction_plan__production_plan',
                   'subproduction_plan__production_plan__product'
               ).annotate(count=Sum('count'))
-        ret = {}
+        rets = []
         for i in qs:
+            ret = {}
             ret['plan'] = ProductionPlanSimpleSerializer(instance=ProductionPlan.objects.get(
                           id= i['subproduction_plan__production_plan'])).data
             ret['product'] = MaterialSimpleSerializer(instance=Material.objects.get(
                           id=i['subproduction_plan__production_plan__product'])).data
             ret['count'] = i['count']
-        return ret
+            rets.append(ret)
+        return rets
 
     def get_count_work(self, obj):