Error Message when trying to Access Dynamics SL 2011

I'm getting the following message when I try to Access the Dynamics SL application.

SQL Server error message 515

Microsoft SQL Server Native Cliente 10.0 Cannot insert the value NULL en the column AccessDate, Table "SYSVIPROCON.DBO.ACCESS" The column does not allow null values.

Does anybody knows why is this happening.

We are running Dynamics SL with the spanish overlay. And the reginal settings in the server is set to Spanish(México)