diff --git a/hb_server/apps/mtm/serializers.py b/hb_server/apps/mtm/serializers.py
index 3e34690..081dc49 100644
--- a/hb_server/apps/mtm/serializers.py
+++ b/hb_server/apps/mtm/serializers.py
@@ -17,7 +17,7 @@ class MaterialDetailSerializer(serializers.ModelSerializer):
         fields = '__all__'
     
     def get_processes_(self, obj):
-        steps = UsedStep.objects.filter(subproducation__product=obj)
+        steps = UsedStep.objects.filter(subproduction__product=obj)
         objs = Process.objects.filter(step_process__in=steps).order_by('number')
         return ProcessSimpleSerializer(instance=objs, many=True).data