diff -urN sw.original/source/core/SwNumberTree/SwNumberTree.cxx sw/source/core/SwNumberTree/SwNumberTree.cxx
--- sw.original/source/core/SwNumberTree/SwNumberTree.cxx	2008-04-10 20:30:07.000000000 +0800
+++ sw/source/core/SwNumberTree/SwNumberTree.cxx	2008-04-23 10:42:33.777750000 +0800
@@ -349,7 +349,7 @@
     }
     while (aIt != mChildren.end() && *aIt != pNode);
 
-    SetLastValid(aIt);
+    SetLastValid(aIt, true);
 }
 
 void SwNumberTreeNode::Validate(const SwNumberTreeNode * pNode) const