Fix missing import

Change-Id: I8a6d538a4c3214232b73673b6a503cb2abafc365
diff --git a/TestON/tests/USECASE/SegmentRouting/UP4/UP4.py b/TestON/tests/USECASE/SegmentRouting/UP4/UP4.py
index d569ee5..99fbf4c 100644
--- a/TestON/tests/USECASE/SegmentRouting/UP4/UP4.py
+++ b/TestON/tests/USECASE/SegmentRouting/UP4/UP4.py
@@ -281,7 +281,8 @@
             Disconnect P4RT client
         """
         try:
-            from tests.USECASE.SegmentRouting.dependencies.up4 import UP4
+            from tests.USECASE.SegmentRouting.dependencies.up4 import UP4, \
+                N_FLOWS_PER_UE
             from tests.USECASE.SegmentRouting.dependencies.Testcaselib import \
                 Testcaselib as run
         except ImportError as e: