diff --git a/product/ERP5OOo/Document/DMSFile.py b/product/ERP5OOo/Document/DMSFile.py
index 80b671fa80c8d0aab46513c314c245d42c8db080..d02267761abe9f8e766783dbde50095536669947 100644
--- a/product/ERP5OOo/Document/DMSFile.py
+++ b/product/ERP5OOo/Document/DMSFile.py
@@ -162,9 +162,6 @@ class DMSFile(XMLObject,File):
   searchable_attrs=('title','description','id','reference','version',
       'short_title','keywords','subject','source_reference','source_project_title')
 
-  # XXX a hack-around untill JPS's Data property sheets stops to break thins :)
-  content_type='application/unknown'
-
   ### Content indexing methods
   security.declareProtected(Permissions.View, 'getSearchableText')
   def getSearchableText(self, md=None):
diff --git a/product/ERP5OOo/Document/OOoDocument.py b/product/ERP5OOo/Document/OOoDocument.py
index 8605d7ebb170763b0c9f1b29bfcceeaf7530f834..cd2b1ba7d8918c995d24c930f77148955287a492 100644
--- a/product/ERP5OOo/Document/OOoDocument.py
+++ b/product/ERP5OOo/Document/OOoDocument.py
@@ -99,7 +99,6 @@ class OOoDocument(DMSFile, CachingMixin):
   property_sheets = ( PropertySheet.Base
                     , PropertySheet.CategoryCore
                     , PropertySheet.DublinCore
-                    , PropertySheet.Data
                     , PropertySheet.Version
                     , PropertySheet.Reference
                     , PropertySheet.Document
diff --git a/product/ERP5OOo/PropertySheet/DMSFile.py b/product/ERP5OOo/PropertySheet/DMSFile.py
index a88bce06add270c0138e6d57daa4a5d18f13d818..19a01698aeabf1e3a80e78c4f37682fddf63c8b7 100644
--- a/product/ERP5OOo/PropertySheet/DMSFile.py
+++ b/product/ERP5OOo/PropertySheet/DMSFile.py
@@ -31,6 +31,11 @@ class DMSFile:
   """
 
   _properties = (
+        {   'id'          : 'content_type',
+            'description' : 'content type',
+            'type'        : 'string',
+            'default'     : 'application/unknown',
+            'mode'        : 'w' },
     )
 
   _categories = ('destination','similar','predecessor','successor','source_project','publication_section','classification',