diff --git a/bt5/erp5_base/WorkflowTemplateItem/portal_workflow/movement_resource_interaction_workflow/scripts/Movement_copyQuantityUnitFromResource.xml b/bt5/erp5_base/WorkflowTemplateItem/portal_workflow/movement_resource_interaction_workflow/scripts/Movement_copyQuantityUnitFromResource.xml
index 595865de219b55b6cde52ec3d59829bfe8481962..32fb735fc56f40ae8a1f31a6362c841a0f2016f6 100644
--- a/bt5/erp5_base/WorkflowTemplateItem/portal_workflow/movement_resource_interaction_workflow/scripts/Movement_copyQuantityUnitFromResource.xml
+++ b/bt5/erp5_base/WorkflowTemplateItem/portal_workflow/movement_resource_interaction_workflow/scripts/Movement_copyQuantityUnitFromResource.xml
@@ -54,10 +54,13 @@
 \n
 resource = movement.getResourceValue()\n
 if resource is not None:\n
-  # if the movement already have a quantity unit which is valid for this resource, don\'t change it\n
-  movement_quantity_unit = movement.getQuantityUnit()\n
-  if movement_quantity_unit and movement_quantity_unit in resource.getQuantityUnitList():\n
-    return\n
+  # quantity unit can be acquired from resource.\n
+  # (Amount class has getQuantityUnit method for backward compatibility and it tries to acquire value from resource).\n
+  if movement.hasCategory(\'quantity_unit\'):\n
+    # if the movement already have a quantity unit which is valid for this resource, don\'t change it\n
+    movement_quantity_unit = movement.getQuantityUnit()\n
+    if movement_quantity_unit and movement_quantity_unit in resource.getQuantityUnitList():\n
+      return\n
   # otherwise initialise to the default quantity unit\n
   movement.setQuantityUnit(resource.getDefaultQuantityUnit())\n
 </string> </value>
diff --git a/bt5/erp5_base/bt/change_log b/bt5/erp5_base/bt/change_log
index 6f9f41ec2fd9b60fd335bd79604d646f8517e964..0a6f86c4331266a4c1ff649456261f9c16f5e899 100644
--- a/bt5/erp5_base/bt/change_log
+++ b/bt5/erp5_base/bt/change_log
@@ -1,3 +1,6 @@
+2010-09-30 yusei
+* Update movement_resource_interaction_workflow and set quantity unit value to movement forcedly if current value is acquired from resource.
+
 2010-09-28 tatuya
 * Fix a issue that all the base contribution are not copied when change the resource on a movement.
 
diff --git a/bt5/erp5_base/bt/revision b/bt5/erp5_base/bt/revision
index e39afc8dd2d0b830e59372f6e3c0549322c0a24e..354d30ba65ad042b77fcc8e08062c000a1a2e624 100644
--- a/bt5/erp5_base/bt/revision
+++ b/bt5/erp5_base/bt/revision
@@ -1 +1 @@
-868
\ No newline at end of file
+869
\ No newline at end of file