diff --git a/product/CMFCategory/PropertySheet/BaseCategory.py b/product/CMFCategory/PropertySheet/BaseCategory.py
index 324bb6bf70fcf0b44963dcdd8b0c100a096e703a..a846d1be7ae8ce483530f93544c42969065b380e 100755
--- a/product/CMFCategory/PropertySheet/BaseCategory.py
+++ b/product/CMFCategory/PropertySheet/BaseCategory.py
@@ -44,8 +44,9 @@ class BaseCategory:
             'mode'        : 'w' },
         {   'id'          : 'acquisition_portal_type',
             'description' : 'The portal types to browse',
-            'type'        : 'lines',
+            'type'        : 'tales',
             'default'     : [],
+            'multivalued' : 1,
             'mode'        : 'w' },
         {   'id'          : 'fallback_base_category',
             'description' : 'another base category to get if everything else fails',