New problem with PHP "odbc_exec".

Hi! I don't understand why PHP is having trouble with the odbc_exec. Is there a bug in PHP code? Here's what the error messages said! "SQL error: [OpenLink][ODBC][Driver]No key columns found for table referenced by keyset driven cursor., SQL state IM909 in SQLExecDirect". This show that it had to do with primary (or secondary) keys or index issues. I'm using MS-SQL Sever and this table I'm using in the database have primary key already! So, what can I do to fix it? I need it to be working. When I use the Linux odbctest command and it execute without a problem. So, it is obvious the problem lie with PHP code, odbc_exec(); Thanks, Scott