diff --git a/bt5/erp5_pdm/bt/change_log b/bt5/erp5_pdm/bt/change_log
index 20c3a7941940d20274c42d4086de66fcc2a3f733..9afa531fec2553e15c71b9ad48638f09aaecb8f6 100644
--- a/bt5/erp5_pdm/bt/change_log
+++ b/bt5/erp5_pdm/bt/change_log
@@ -1,5 +1,6 @@
 2009-04-30 yusei
 * Simplify field libraries and proxy fields. Old field libraries are kept for backward compatibility.
+* Need recent version of erp5_core(newer than r1193).
 
 2009-04-18 Kazuhiko
 * Version 5.4.1
diff --git a/bt5/erp5_pdm/bt/revision b/bt5/erp5_pdm/bt/revision
index 0e92c3c0fc954ea08c56cf2c6b18bd68a0c7879b..e0da8ae09ae60f2173f5ab88e31a7359c855066a 100644
--- a/bt5/erp5_pdm/bt/revision
+++ b/bt5/erp5_pdm/bt/revision
@@ -1 +1 @@
-306
\ No newline at end of file
+309
\ No newline at end of file