Index: wcs/fields.py
===================================================================
--- wcs/fields.py	(révision 2267)
+++ wcs/fields.py	(copie de travail)
@@ -746,6 +746,32 @@
     def stats(self, values):
         return item_items_stats(self, values)
 
+    def get_csv_heading(self):
+        labels = [self.label]
+        if self.max_choices:
+            labels.extend(['']*(self.max_choices-1))
+        elif len(self.items):
+            labels.extend(['']*(len(self.items)-1))
+        return labels
+
+    def get_csv_value(self, value):
+        values = []
+        for one_value in value:
+            values.append(one_value)
+        if self.max_choices:
+            nb_columns = self.max_choices
+        elif len(self.items):
+            nb_columns = len(self.items)
+        else:
+            nb_columns = 1
+
+        if len(values) > nb_columns:
+            # this would happen if max_choices is set after forms were already
+            # filled with more values
+            values = values[:nb_columns]
+        elif len(values) < nb_columns:
+            values.extend(['']*(nb_columns-len(values)))
+        return values
 register_field_class(ItemsField)