diff --git a/product/ERP5Type/Accessor/Acquired.py b/product/ERP5Type/Accessor/Acquired.py
index 96dc3b5da5c51dc155ba23a5809cdb12cb47b836..19b87c77eb6e8f895eec1563d336791f8e5c5524 100644
--- a/product/ERP5Type/Accessor/Acquired.py
+++ b/product/ERP5Type/Accessor/Acquired.py
@@ -70,6 +70,8 @@ class DefaultGetter(BaseGetter):
         acquisition_object_id = tuple(acquisition_object_id)
       if isinstance(acquisition_portal_type, list):
         acquisition_portal_type = tuple(acquisition_portal_type)
+      if isinstance(alt_accessor_id, list):
+        alt_accessor_id = tuple(alt_accessor_id)
 
       self._acquisition_base_category = acquisition_base_category
       self._acquisition_portal_type = acquisition_portal_type
@@ -158,6 +160,8 @@ class ListGetter(BaseGetter):
         acquisition_object_id = tuple(acquisition_object_id)
       if isinstance(acquisition_portal_type, list):
         acquisition_portal_type = tuple(acquisition_portal_type)
+      if isinstance(alt_accessor_id, list):
+        alt_accessor_id = tuple(alt_accessor_id)
 
       self._acquisition_base_category = acquisition_base_category
       self._acquisition_portal_type = acquisition_portal_type
diff --git a/product/ERP5Type/Accessor/AcquiredProperty.py b/product/ERP5Type/Accessor/AcquiredProperty.py
index 74b9cf4e2baddbd4fcc660d5c459ec43d980d5e9..bedc09416d1ed46067b5cd1b65c6011914a9d22e 100644
--- a/product/ERP5Type/Accessor/AcquiredProperty.py
+++ b/product/ERP5Type/Accessor/AcquiredProperty.py
@@ -74,6 +74,8 @@ class Getter(BaseGetter):
         acquisition_portal_type = tuple(acquisition_portal_type)
       if isinstance(acquisition_object_id, list):
         acquisition_object_id = tuple(acquisition_object_id)
+      if isinstance(alt_accessor_id, list):
+        alt_accessor_id = tuple(alt_accessor_id)
 
       self._acquisition_base_category = acquisition_base_category
       self._acquisition_portal_type = acquisition_portal_type
@@ -161,6 +163,8 @@ class Setter(BaseSetter):
         acquisition_portal_type = tuple(acquisition_portal_type)
       if isinstance(acquisition_object_id, list):
         acquisition_object_id = tuple(acquisition_object_id)
+      if isinstance(alt_accessor_id, list):
+        alt_accessor_id = tuple(alt_accessor_id)
 
       self._acquisition_base_category = acquisition_base_category
       self._acquisition_portal_type = acquisition_portal_type