diff --git a/browser/form.py b/browser/form.py
index 4914583..1a8d26c 100644
--- a/browser/form.py
+++ b/browser/form.py
@@ -159,7 +159,11 @@ class ObjectForm(NodeView):
         for k, v in data.items():
             #overwrite data with values from request.form
             if k in self.request.form:
-                data[k] = toUnicode(form[k])
+                field = self.schema.fields.get(k)
+                if field:
+                    fi = field.getFieldInstance(self.instance)
+                    data[k] = fi.marshall(fi.unmarshall(form[k]))
+                    #data[k] = toUnicode(form[k])
         return data
 
     @Lazy
diff --git a/schema/field.py b/schema/field.py
index 2fd2be2..e264705 100644
--- a/schema/field.py
+++ b/schema/field.py
@@ -89,7 +89,8 @@ class RelationFieldInstance(FieldInstance, BaseRelationFieldInstance):
 
     def marshall(self, value):
         if value:
-            return dict(title=value.title, uid=util.getUidForObject(value.context))
+            return dict(title=value.title, 
+                        uid=util.getUidForObject(baseObject(value)))
 
     def display(self, value):
         if value: