ALTER SQL Server 2000 functions on SQL Express

I installed SQL Server Management Express and try to access to a SQL Server 2000 remotly.

I connected correctly but when I try to alter an existing function, I get the following error message:

TITLE: Microsoft SQL Server Management Studio Express

Property AnsiNullsStatus is not available for UserDefinedFunction '[dbo].[functionName]'. This property may not exist for this object, or may not be retrievable due to insufficient access rights. (Microsoft.SqlServer.Express.Smo)

Note that functionName contain the correct function name.

Can someone confirm me that SQL Server Managmt Express can not alter function from previous SQL version or may I need to set some parameters on Server 2000.

Thanks

I'm moving this to the Tools forum.

Mike