diff --git a/src/collective/dms/batchimport/fileimporter.py b/src/collective/dms/batchimport/fileimporter.py
index 2201f01..31d3b96 100644
--- a/src/collective/dms/batchimport/fileimporter.py
+++ b/src/collective/dms/batchimport/fileimporter.py
@@ -28,9 +28,12 @@ class IImportFileFormSchema(form.Schema):
     portal_type = schema.Text(required=False)
     location = schema.Text(required=False)
     owner = schema.Text(required=False)
-    treating_group = schema.Text(required=False)
+    treating_groups = schema.Text(required=False)  # new, comme separated identifiers
     keywords = schema.Text(required=False)  # comma separated identifiers
 
+    # legacy
+    treating_group = schema.Text(required=False)
+
 
 class ImportFileForm(form.SchemaForm):
     schema = IImportFileFormSchema
@@ -71,14 +74,18 @@ class ImportFileForm(form.SchemaForm):
         portal_type = data['portal_type']
         filename = data['file'].filename
         owner = data['owner']
-        treating_group = data['treating_group']
+        if data['treating_group']:  # legacy
+            treating_groups = set([data['treating_group']])
+        else:
+            treating_groups = set([x.strip() for x in (data['treating_groups'] or '').split(',')])
+
         folder = self.get_folder(data['location'])
         keywords = set([x.strip() for x in (data['keywords'] or '').split(',')])
 
         document_id = self.convertTitleToId(data.get('title') or os.path.splitext(filename)[0])
 
         utils.createDocument(self, folder, portal_type, document_id,
-                filename, data['file'], owner, treating_group=treating_group,
+                filename, data['file'], owner, treating_groups=treating_groups,
                 metadata={
                     'title': data.get('title'),
                     'keywords': keywords,
diff --git a/src/collective/dms/batchimport/utils.py b/src/collective/dms/batchimport/utils.py
index 6e06c5f..cc2cc35 100644
--- a/src/collective/dms/batchimport/utils.py
+++ b/src/collective/dms/batchimport/utils.py
@@ -21,7 +21,7 @@ log = logging.getLogger('collective.dms.batchimport')
 
 
 def createDocument(context, folder, portal_type, document_id, filename,
-        file_object, owner=None, treating_group=None, metadata=None):
+        file_object, owner=None, treating_groups=None, metadata=None):
     if owner is None:
         owner = api.user.get_current().id
 
@@ -47,11 +47,11 @@ def createDocument(context, folder, portal_type, document_id, filename,
         if IDeadline and IDeadline.providedBy(document):
             document.deadline = deadlineDefaultValue(None)
 
-        if treating_group:
+        if treating_groups:
             canwrite_dm = LocalRolesToPrincipalsDataManager(document,
                     IDmsDocument['treating_groups'])
             canwrite_dm.set([])
-            canwrite_dm.set([treating_group])
+            canwrite_dm.set(list(treating_groups))
             document.reindexObjectSecurity()
 
         version = createContentInContainer(document, 'dmsmainfile',