diff --git a/src/scida/configfiles/units/gadget.yaml b/src/scida/configfiles/units/gadget.yaml
index 418419de..d3e551b1 100644
--- a/src/scida/configfiles/units/gadget.yaml
+++ b/src/scida/configfiles/units/gadget.yaml
@@ -22,6 +22,8 @@ fields:
     SubfindVelDisp: km / s
     Velocities: km * a^(1/2) / s
     TimeStep:
+    GroupFirstSub: none
+    LocalSubhaloID: none
   Offsets: "no_units" # "no_units" indicates that no field has units in this group
   # only do this for fields that have wrong or no metadata
   PartType0:
diff --git a/src/scida/customs/arepo/dataset.py b/src/scida/customs/arepo/dataset.py
index f0d7bd9b..162dffa6 100644
--- a/src/scida/customs/arepo/dataset.py
+++ b/src/scida/customs/arepo/dataset.py
@@ -423,7 +423,7 @@ def add_catalogIDs(self) -> None:
             # calculate first subhalo of each halo that a particle belongs to
             self.add_groupquantity_to_particles("GroupFirstSub", parttype=key)
             pdata["SubhaloID"] = pdata["GroupFirstSub"] + pdata["LocalSubhaloID"]
-            pdata["SubHaloID"] = da.where(
+            pdata["SubhaloID"] = da.where(
                 pdata["SubhaloID"] == index_unbound, index_unbound, pdata["SubhaloID"]
             )
 
diff --git a/tests/customs/test_arepo.py b/tests/customs/test_arepo.py
index 6ef8ebaf..076338ac 100644
--- a/tests/customs/test_arepo.py
+++ b/tests/customs/test_arepo.py
@@ -319,3 +319,12 @@ def test_default_recipes(testdatapath):
     obj2 = load(testdatapath, units=False)
     v2 = obj2.data["PartType0"]["Temperature"][0].compute()
     assert np.allclose(v1, v2)
+
+
+@require_testdata_path("interface", only=["TNG50-4_snapshot"])
+def test_allunitsdiscovered(testdatapath, caplog):
+    load(testdatapath)
+    caplog.set_level(logging.DEBUG)
+    assert (
+        "Cannot determine units from neither unit file nor metadata" not in caplog.text
+    )