diff --git a/addons/base/controllers/main.py b/addons/base/controllers/main.py
index af7031179da..b976ec43fed 100644
--- a/addons/base/controllers/main.py
+++ b/addons/base/controllers/main.py
@@ -1086,11 +1086,9 @@ class Export(View):
         return fields
 
     @openerpweb.jsonrequest
-    def get_fields(self, req, model, prefix='', name= '', params={}):
-        import_compat = params.get("import_compat", False)
-
+    def get_fields(self, req, model, prefix='', name= '',
+                   import_compat=True, field_parent_type=None):
         fields = self.fields_get(req, model)
-        field_parent_type = params.get("parent_field_type",False)
 
         if import_compat and field_parent_type and field_parent_type == "many2one":
             fields = {}
diff --git a/addons/base/static/src/js/data_export.js b/addons/base/static/src/js/data_export.js
index 932de2e1632..40c1d90fd44 100644
--- a/addons/base/static/src/js/data_export.js
+++ b/addons/base/static/src/js/data_export.js
@@ -54,7 +54,7 @@ openerp.base.DataExport = openerp.base.Dialog.extend({
             if (import_comp) {
                 self.rpc("/base/export/get_fields", {
                     model: self.dataset.model,
-                    params: { import_compat: parseInt(import_comp, 10) }
+                    import_compat: parseInt(import_comp, 10)
                 }, function (records) {
                     got_fields.resolve();
                     self.on_show_data(records);
@@ -184,15 +184,12 @@ openerp.base.DataExport = openerp.base.Dialog.extend({
                     if (self.$element.find("tr[id='treerow-" + self.field_id +"']").find('img').attr('src') === '/base/static/src/img/expand.gif') {
                         if (model) {
                             var import_comp = self.$element.find("#import_compat option:selected").val();
-                            var params = {
-                                import_compat: parseInt(import_comp),
-                                parent_field_type : record['field_type']
-                            };
                             self.rpc("/base/export/get_fields", {
                                 model: model,
                                 prefix: prefix,
                                 name: name,
-                                params: params
+                                import_compat: parseInt(import_comp, 10),
+                                parent_field_type : record['field_type']
                             }, function(results) {
                                 self.on_show_data(results);
                             });