--- ibx/trunk/fbintf/client/3.0/FB30Transaction.pas	2021/02/25 11:27:14	314
+++ ibx/trunk/fbintf/client/3.0/FB30Transaction.pas	2021/02/25 11:56:36	315
@@ -107,7 +107,7 @@ end;
 
 function TFB30Transaction.GetActivityIntf(att: IAttachment): IActivityMonitor;
 begin
-  Result := att as TFB30Attachment;
+  att.QueryInterface(IActivityMonitor,Result);
 end;
 
 procedure TFB30Transaction.SetInterface(api: TFBClientAPI);