diff --git a/product/ERP5/mixin/base_convertable.py b/product/ERP5/mixin/base_convertable.py
index 8cbcb20c869c0b33e9c88d1060eeb00954be50a6..225ebc0f9fbb1542a77965919ebf8a633b86a635 100644
--- a/product/ERP5/mixin/base_convertable.py
+++ b/product/ERP5/mixin/base_convertable.py
@@ -59,3 +59,11 @@ class BaseConvertableMixin:
     """
     """
     raise NotImplementedError
+
+  def convertFile(self, **kw):
+    """
+    Workflow transition invoked when conversion occurs.
+    Usefull for document instances which are not associated
+    to processing_status_workflow like TempObject.
+    """
+  convertFile = WorkflowMethod(convertFile)