diff --git a/backend/src/services/sumo_access/queries/case.py b/backend/src/services/sumo_access/queries/case.py
index 7f1895451..7100a5b1c 100644
--- a/backend/src/services/sumo_access/queries/case.py
+++ b/backend/src/services/sumo_access/queries/case.py
@@ -5,12 +5,17 @@
 
 async def get_stratigraphic_column_identifier(sumo_client: SumoClient, case_id: str) -> str:
     """Get stratigraphic column identifier for a case (assuming unique for all objects)"""
-    params = {
-        "query": f"_sumo.parent_object:{case_id}",
+    query = {
         "size": 1,
-        "select": "masterdata.smda.stratigraphic_column.identifier",
+        "query": {
+            "bool": {
+                "must": [
+                    {"match": {"_sumo.parent_object.keyword": case_id}},
+                ]
+            }
+        },
     }
-    response = await sumo_client.get_async("/search", params)
+    response = await sumo_client.post_async("/search", json=query)
     result = response.json()
     hits = result["hits"]["hits"]
     return hits[0]["_source"]["masterdata"]["smda"]["stratigraphic_column"]["identifier"]
@@ -18,12 +23,17 @@ async def get_stratigraphic_column_identifier(sumo_client: SumoClient, case_id:
 
 async def get_field_identifiers(sumo_client: SumoClient, case_id: str) -> List[str]:
     """Get field identifiers for a case (assuming unique for all objects)"""
-    params = {
-        "query": f"_sumo.parent_object:{case_id}",
+    query = {
         "size": 1,
-        "select": "masterdata.smda.field.identifier",
+        "query": {
+            "bool": {
+                "must": [
+                    {"match": {"_sumo.parent_object.keyword": case_id}},
+                ]
+            }
+        },
     }
-    response = await sumo_client.get_async("/search", params)
+    response = await sumo_client.post_async("/search", json=query)
     result = response.json()
     hits = result["hits"]["hits"]
     fields = hits[0]["_source"]["masterdata"]["smda"]["field"]