Violation of PRIMARY KEY constraint 'PK_OrderForms'. Cannot insert duplicate key in object 'dbo.OrderForms'

This may happens because a multiple users logging in and checking out under the same userid/password at the same time so same basket this may cause a corrupted basket,

any way find the solution here !

http://social.msdn.microsoft.com/Forums/en-US/commserver2007/thread/898b5886-cb62-44d6-b64b-de719faf5b84/