diff --git a/product/ERP5Type/Accessor/Value.py b/product/ERP5Type/Accessor/Value.py
index 7a4f3db04c6cc42c3d2f467690fdefee6e23c3f0..359df5a6e5f4ee0f073f724fd408bfcc1541fe20 100644
--- a/product/ERP5Type/Accessor/Value.py
+++ b/product/ERP5Type/Accessor/Value.py
@@ -48,7 +48,8 @@ class SetSetter(BaseSetter):
     def __call__(self, instance, *args, **kw):
       if self._warning:
         LOG("ERP5Type Deprecated Setter Id:",0, self._id)
-      instance._setValue(self._key, args[0],
+      value = set(args[0])
+      instance._setValue(self._key, value,
                                                 spec=kw.get('spec',()),
                                                 filter=kw.get('filter', None),
                                                 portal_type=kw.get('portal_type',()),
diff --git a/product/ERP5Type/Base.py b/product/ERP5Type/Base.py
index 859bf9606eec9d80ee2ff01a1a313d22469a00c4..cf74e8a402a6f47c91b2e9d6f1ca119af83d91da 100644
--- a/product/ERP5Type/Base.py
+++ b/product/ERP5Type/Base.py
@@ -2004,7 +2004,7 @@ class Base( CopyContainer,
       # We have been provided a string
       path = target
       if path.startswith(start_string): path = path[start_string_len:] # Prevent duplicating base category
-    elif isinstance(target, (tuple, list)):
+    elif isinstance(target, (tuple, list, set, frozenset)):
       # We have been provided a list or tuple
       path_list = []
       for target_item in target:
diff --git a/product/ERP5Type/tests/testERP5Type.py b/product/ERP5Type/tests/testERP5Type.py
index cb102391ffb2d73f1461ea692c9f45bb437a6c39..adab7c8dacdce33091cd162b4926fe9b6b692245 100644
--- a/product/ERP5Type/tests/testERP5Type.py
+++ b/product/ERP5Type/tests/testERP5Type.py
@@ -675,6 +675,7 @@ class TestPropertySheet:
       person.setRegionValueList([alpha, alpha])
       self.assertEquals(person.getRegionList(), ['alpha', 'alpha'])
       person.setRegionValueSet([alpha, alpha])
+      self.assertEquals(person.getRegionList(), ['alpha'])
       self.assertEquals(person.getRegionSet(), ['alpha'])
       person.setRegionValueList([alpha, beta, alpha])
       self.assertEquals(person.getRegionList(), ['alpha', 'beta', 'alpha'])