diff --git a/canopen/sdo/base.py b/canopen/sdo/base.py
index 0bb068b4..81d5e710 100644
--- a/canopen/sdo/base.py
+++ b/canopen/sdo/base.py
@@ -105,10 +105,12 @@ def __getitem__(self, subindex: Union[int, str]) -> SdoVariable:
         return SdoVariable(self.sdo_node, self.od[subindex])
 
     def __iter__(self) -> Iterator[int]:
-        return iter(self.od)
+        # Skip the "highest subindex" entry, which is not part of the data
+        return filter(None, iter(self.od))
 
     def __len__(self) -> int:
-        return len(self.od)
+        # Skip the "highest subindex" entry, which is not part of the data
+        return len(self.od) - int(0 in self.od)
 
     def __contains__(self, subindex: Union[int, str]) -> bool:
         return subindex in self.od
@@ -127,6 +129,7 @@ def __getitem__(self, subindex: Union[int, str]) -> SdoVariable:
         return SdoVariable(self.sdo_node, self.od[subindex])
 
     def __iter__(self) -> Iterator[int]:
+        # Skip the "highest subindex" entry, which is not part of the data
         return iter(range(1, len(self) + 1))
 
     def __len__(self) -> int:
diff --git a/doc/sdo.rst b/doc/sdo.rst
index a1436572..29314028 100644
--- a/doc/sdo.rst
+++ b/doc/sdo.rst
@@ -189,7 +189,10 @@ API
 
     .. describe:: iter(record)
 
-       Return an iterator over the subindexes from the record.
+       Return an iterator over the subindexes from the record.  Only those with
+       a matching object dictionary entry are considered.  The "highest
+       subindex" entry is officially not part of the data and thus skipped in
+       the yielded values.
 
     .. describe:: subindex in record
 
@@ -198,7 +201,9 @@ API
 
     .. describe:: len(record)
 
-       Return the number of subindexes in the record.
+       Return the number of subindexes in the record, not counting the "highest
+       subindex" entry itself.  Only those with a matching object dictionary
+       entry are considered.
 
     .. method:: values()
 
@@ -220,25 +225,27 @@ API
     .. describe:: iter(array)
 
        Return an iterator over the subindexes from the array.
-       This will make a SDO read operation on subindex 0 in order to get the
-       actual length of the array.
+       This will make an SDO read operation on subindex 0 in order to get the
+       actual length of the array.  This "highest subindex" entry is officially
+       not part of the data and thus skipped in the yielded values.
 
     .. describe:: subindex in array
 
        Return ``True`` if the subindex (as int) or name (as string) exists in
        the array.
-       This will make a SDO read operation on subindex 0 in order to get the
+       This will make an SDO read operation on subindex 0 in order to get the
        actual length of the array.
 
     .. describe:: len(array)
 
-       Return the length of the array.
-       This will make a SDO read operation on subindex 0.
+       Return the length of the array, not counting the "highest subindex" entry
+       itself.
+       This will make an SDO read operation on subindex 0.
 
     .. method:: values()
 
        Return a list of :class:`canopen.sdo.SdoVariable` in the array.
-       This will make a SDO read operation on subindex 0 in order to get the
+       This will make an SDO read operation on subindex 0 in order to get the
        actual length of the array.
 
 
diff --git a/test/test_sdo.py b/test/test_sdo.py
index 212fc7f5..993d4acc 100644
--- a/test/test_sdo.py
+++ b/test/test_sdo.py
@@ -20,7 +20,6 @@ def setUp(self):
         node = canopen.LocalNode(1, SAMPLE_EDS)
         self.sdo_node = node.sdo
 
-    @unittest.expectedFailure
     def test_record_iter_length(self):
         """Assume the "highest subindex supported" entry is not counted.