diff -r 8fad57b884a7 -r ff2dde050a4c src/ai/api/ai_transactionmode.cpp
--- a/src/ai/api/ai_transactionmode.cpp	Tue Mar 27 10:17:47 2007 +0000
+++ b/src/ai/api/ai_transactionmode.cpp	Tue Mar 27 10:22:39 2007 +0000
@@ -62,6 +62,11 @@
 	/* Make sure we are stopped */
 	this->Stop();
 
+	/* Remove the costs this transaction costs from the total costs, so any
+	 *  'accounting' running on the background will get the real costs for
+	 *  executing, and not the double value of both testing and executing */
+	this->IncreaseDoCommandCosts(-this->GetCosts());
+
 	/* Switch to a forced execute mode */
 	AIExecMode exec;