diff --git a/src/dags/libs/manifest_analyzer.py b/src/dags/libs/manifest_analyzer.py
index 5f5672172396032702f23d12923650553094691f..7f5a09c33673b9d94bc92f5acdc2eb5474ea046d 100644
--- a/src/dags/libs/manifest_analyzer.py
+++ b/src/dags/libs/manifest_analyzer.py
@@ -98,7 +98,7 @@ class EntityNode(object):
         for parent in self.parents:
             if parent.system_srn:
                 # ':' at the end is for showing that it is reference if parent srn was surrogate-key.
-                if "surrogate-key" in parent.system_srn:
+                if "surrogate-key" in parent.srn:
                     content = content.replace(parent.srn, f"{parent.system_srn}:")
                 else:
                     content = content.replace(parent.srn, f"{parent.system_srn}")
diff --git a/tests/plugin-unit-tests/test_manifest_analyzer.py b/tests/plugin-unit-tests/test_manifest_analyzer.py
index f3620fbfe55c96269e206f92d86f6c43d4e20314..c6fd5f65ad85858c19f9553e874a7903b96e538a 100644
--- a/tests/plugin-unit-tests/test_manifest_analyzer.py
+++ b/tests/plugin-unit-tests/test_manifest_analyzer.py
@@ -204,7 +204,7 @@ class TestManifestAnalyzer(object):
         assert "surrogate-key:wpc-1" in (e.srn for e in manifest_analyzer.unprocessed_entities)
 
     @pytest.mark.parametrize(
-        "manifest,expected_replaced_srns",
+        "manifest,system_srn,expected_replaced_srns",
         [
             pytest.param(
                 [
@@ -217,7 +217,8 @@ class TestManifestAnalyzer(object):
                     }
 
                 ],
-                "system_srn: surrogate-key:wpc2:",
+                "test:work-product--WorkProduct:7b37ff0e13ac40a0ac35b7e5ca60e5a7",
+                "test:work-product--WorkProduct:7b37ff0e13ac40a0ac35b7e5ca60e5a7:",
                 id="Surrogate key"
             ),
             pytest.param(
@@ -231,12 +232,13 @@ class TestManifestAnalyzer(object):
                     }
 
                 ],
+                "osdu:reference-data--ResourceSecurityClassification:RESTRICTED:test",
                 "osdu:reference-data--ResourceSecurityClassification:RESTRICTED:test:",
                 id="Real Ids"
             )
         ]
     )
-    def test_update_parent_srn_with_system_srn(self, manifest, expected_replaced_srns):
+    def test_update_parent_srn_with_system_srn(self, manifest, system_srn, expected_replaced_srns):
         data = [ManifestEntity(entity=e, schema="") for e in manifest]
         token_refresher = AirflowTokenRefresher()
         manifest_analyzer = ManifestAnalyzer(
@@ -246,6 +248,6 @@ class TestManifestAnalyzer(object):
 
         for entity in manifest_analyzer.entity_queue():
             entity.replace_parents_surrogate_srns()
-            entity.system_srn = self.process_entity(entity)
+            entity.system_srn = system_srn
             if entity.content.get("ref"):
                 assert entity.content["ref"] == expected_replaced_srns