Altiris Client lost from Server

Hi All,

         I would like to request your help according to my topic "Altiris Client lost from Server", I notice that inventory of many clients lost from the server.

I remote to those clients found that altiris agent running normally and send inventory to server every day but when I search on the server, not found and in SQL database also. could you please help me to solve this problem (Please see attached file for example of one client)

Detail:

Client

        - Total 7000 clients (3 domains)    

Altiris Server

       - OS: Windows Server 2008 R2 Standard

       - Version 7.1 SP1

Site Server: 9 locations