diff --git a/awx/api/views.py b/awx/api/views.py
index 08015cdfc6..0afb08f666 100644
--- a/awx/api/views.py
+++ b/awx/api/views.py
@@ -1766,6 +1766,12 @@ class SystemJobTemplateSchedulesList(SubListCreateAPIView):
     relationship = 'schedules'
     parent_key = 'unified_job_template'
 
+    def post(self, request, *args, **kwargs):
+        system_job = self.get_parent_object()
+        if system_job.schedules.count() > 0:
+            return Response({"error": "Multiple schedules for Systems Jobs is not allowed"}, status=status.HTTP_400_BAD_REQUEST)
+        return super(SystemJobTemplateSchedulesList, self).post(request, *args, **kwargs)
+
 class SystemJobTemplateJobsList(SubListAPIView):
 
     model = SystemJob