Detailed Cust. Ledg. Entry Error

Hi, I’m using Navision Attain with SQL 2000 server. Just recently, we’ve been getting error messages when posting sales orders and cash receipt journals. The error reads: “The following SQL server error(s) occurred while accessing the Detailed Cust. Ledg. Entry table: 21, “HY000”,[Microsoft].[ODBC SQL Server Driver][SQL Server] Warning: Fatal Error 823 occurred at [current date and time]” After this, the client loses database connection and the client has to be restarted. We’ve had about 6 occurrences in the last 2 days, all with different customer accounts. Any help on the matter would be greatly appreciated. Thanks