Call stored procedure from server side javascript

Hi there,

I'm using the following server side js to call a procedure from an xs-appication:

var body = '';
var conn = $.db.getConnection();
var cst = conn.prepareCall('{CALL mypk.TESTPROCEDURE(?,?)}');
cst.setInt(1,4711);
if (cst.execute()) {
    body = 'Ok'  + cst.getInteger(3);
} else {
    body = 'Failed';
}

The procedure looks like this:

create procedure mypk.TESTPROCEDURE(in factor1 int, out res int) language sqlscript as
begin 
    INSERT INTO "mypk"."TESTTABLE" (SOMEFIELD) VALUES ('1234');
     res := :factor1 + 1000;
end;

The procedure gets executed well and the result value is OK, but the INSERT-statement within the proecdure doesn't get executed (or at least no insert in the TESTTABLE is done).

When the procedure is called from an SQL-window the insert is ok.

What could be wrong here?

Thanks!