Here’s the sql I used to track duplicates records:

SELECT f.AD_Client_ID, win.Name AS OrigWindow, tab.Name AS OrigTab, w.Name AS custom_windowname, t.Name AS custom_tabname, f.AD_Field_ID AS custom_field_id, ft.Name, count()
FROM AD_UserDef_Field f, AD_UserDef_Tab t, AD_UserDef_Win w, AD_Window win, AD_Tab tab, AD_Field_Trl ft
WHERE w.AD_Window_ID = win.AD_Window_ID
AND w.AD_UserDef_Win_ID = t.AD_UserDef_Win_ID
AND t.AD_UserDef_Tab_ID = f.AD_UserDef_Tab_ID
AND t.AD_Tab_ID = tab.AD_Tab_ID
AND ft.AD_Field_ID = f.AD_Field_ID
AND ft.AD_Language='fr_FR'
HAVING COUNT() > 1
GROUP BY f.AD_Client_ID, f.AD_UserDef_Tab_ID, f.AD_Field_ID, w.Name, t.Name, win.Name, tab.Name, ft.Name;