diff --git a/extra_data/display.py b/extra_data/display.py
index 5660e93d..3cfeb547 100644
--- a/extra_data/display.py
+++ b/extra_data/display.py
@@ -270,7 +270,7 @@ def add(self, name):
         if len(diffs_at) != 1 or ((diff_at := diffs_at[0]) % 2 == 0):
             return False  # >1 part changed, or separator part changed
 
-        if len(grp) > 2 and (grp[-1][diff_at] == grp[0][diff_at]):
+        if len(grp) >= 2 and (grp[-1][diff_at] == grp[0][diff_at]):
             return False  # different part changing from current group
 
         self.entries.append(split)
diff --git a/extra_data/tests/test_display.py b/extra_data/tests/test_display.py
index 671783b6..1bc27558 100644
--- a/extra_data/tests/test_display.py
+++ b/extra_data/tests/test_display.py
@@ -87,6 +87,12 @@ def test_group_ok(names, exp):
         "SA1_XTD2_XGM/DOOCS/MAIN:output",
         "SPB_XTD9_XGM/DOOCS/MAIN:output",
     ],
+    [
+        # One part changing each time, but different parts
+        'SQS_ILH_LAS/PROC/BS_CAM_800_OU1',
+        'SQS_ILH_LAS/PROC/BS_CAM_800_OU2',
+        'SQS_ILH_LAS/PROC/BS_CAM_TT_OU2',
+    ],
 ])
 def test_group_fail(names):
     grp = SourceGroup()