diff --git a/bt5/erp5_accounting/bt/change_log b/bt5/erp5_accounting/bt/change_log
index d6b7f6c9100920be71b9095c96dd475537fbb629..3184fabcdcd11b1064903a7d752ed95ef3296b30 100644
--- a/bt5/erp5_accounting/bt/change_log
+++ b/bt5/erp5_accounting/bt/change_log
@@ -1,3 +1,6 @@
+2013-04-17 arnaud.fontaine
+* erp5_simulation should not be required as some system do not use simulation.
+
 2011-12-16 arnaud.fontaine
 * Display "Own Section" along "Third Party" in AccountingTransactionModule_viewAccountingTransactionList.
 
diff --git a/bt5/erp5_accounting/bt/dependency_list b/bt5/erp5_accounting/bt/dependency_list
index 0b67822b4a1adfec21c12cd70e728ae67619c1a8..f947e6ab3eab50b2d4c391d81846142b266a7711 100644
--- a/bt5/erp5_accounting/bt/dependency_list
+++ b/bt5/erp5_accounting/bt/dependency_list
@@ -1,3 +1,2 @@
 erp5_base >= 0.8.3
-erp5_core >= 1.0rc13
-erp5_simulation
\ No newline at end of file
+erp5_core >= 1.0rc13
\ No newline at end of file
diff --git a/bt5/erp5_trade/bt/change_log b/bt5/erp5_trade/bt/change_log
index 5882a4557de2b24061232523468eb795b8eb813f..e0fafdbe703d534a88482d33e42d2f47794ca9b6 100644
--- a/bt5/erp5_trade/bt/change_log
+++ b/bt5/erp5_trade/bt/change_log
@@ -1,3 +1,6 @@
+2013-04-17 arnaud.fontaine
+* erp5_simulation should not be required as some system do not use simulation.
+
 2012-01-05 Kazuhiko
 * move builders from erp5_trade to erp5_simulation_test BT.
 
diff --git a/bt5/erp5_trade/bt/dependency_list b/bt5/erp5_trade/bt/dependency_list
index fe3872c16565fc045645846d27888636a1f2a775..1ad9ae263cac2dc8bcd680a7d6d630c728991fa0 100644
--- a/bt5/erp5_trade/bt/dependency_list
+++ b/bt5/erp5_trade/bt/dependency_list
@@ -1,4 +1,3 @@
 erp5_core (>= 5.4.3)
 erp5_base
-erp5_pdm
-erp5_simulation
\ No newline at end of file
+erp5_pdm
\ No newline at end of file
diff --git a/bt5/erp5_trade/bt/revision b/bt5/erp5_trade/bt/revision
index b90f3750fe25b07f293ed4f29c46df647edaa9e6..208e76adef9130416e9dbd5dcd130a9a7eece3a7 100644
--- a/bt5/erp5_trade/bt/revision
+++ b/bt5/erp5_trade/bt/revision
@@ -1 +1 @@
-1164
\ No newline at end of file
+1165
\ No newline at end of file