Windows 2008 Task Scheduler Problem

Can not enter a Domain User Account in Task Scheduler on Windows 2008, it give me "account name is not valid" error message. I found a solution on Microsoft tech net forum:
"Workaround:
1. Start Task Scheduler
2. Create a new task without changing user and user group (anything else can be specified at this time).
3. Export this task to an xml file (the Scheduled Task configuration file)
4. Delete this task.
5. Open the exported task using a text editor.
6. Find the following section:
DomainName\UserName
Please note that there may be other elements within the Principle node.
7. Change DomainName\UserName (ex. Companyname\administrator) accordingly. Note: DomainName is the NetBIOS name of the domain.
8. Save the file.
9. Import the task into Task Scheduler."

It works.