diff --git a/src/View/Ensembles/Table.py b/src/View/Ensembles/Table.py
index e4006ece..be8a75f3 100644
--- a/src/View/Ensembles/Table.py
+++ b/src/View/Ensembles/Table.py
@@ -71,12 +71,28 @@ class ComboBoxDelegate(QItemDelegate):
                 ]
             )
         elif self._mode == "stricklers":
+            used = list(
+                map(
+                    lambda e: (e.data_type, e._target_data),
+                    self._data.lst
+                )
+            )
+            current = self._data.get(index.row())
+
             self.editor.addItems(
                 [self._trad["not_defined"]] +
                 list(
                     map(
                         lambda s: str(s),
-                        self._study.river.stricklers.stricklers
+                        filter(
+                            # Exclude target data already used for
+                            # this data type
+                            lambda s: (
+                                current.target_data == s or
+                                (current.data_type, s) not in used
+                            ),
+                            self._study.river.stricklers.stricklers
+                        )
                     )
                 )
             )