Only functions and some extended stored procedures can be executed from within a function.

Hi,

I have this function called fn_GetTimedKey()
when I run it in my SQL2005 environment it works fine.

When I run it in
my SQL2008R2 environment I get the error:

Only functions and some
extended stored procedures can be executed from within a function.

The
SQL2008R2 server is new. What can I look for?

Here's the code for the
function:

BEGIN
  DECLARE @v_Key CHAR(12)
  EXEC master..xp_usg_gettimedkey_VAL @v_Key OUTPUT
  RETURN @v_Key
END