sourceSet in function (Jscript) not found any Data View

[Fellipex25]

HI,
I have the code:
var = oDB xfa.sourceSet.DataConnection.clone (1);

oDB.nodes.item (1). query.setAttribute ("text", "CommandType");
oDB.nodes.item (1). query.select.nodes.item (0). value = "SELECT * FROM vw_products";

oDB.open ();
oDB.close ();

This code works perfectly if I call in initialize the form.
(form1.Inicial::initialize - (JavaScript, both))

But the same code does not work if I call a function in Jscript, (Function test {} for example). Not found "sourceSet.DataConnection".
Any idea what could be? I've tried everything but it only works if i put in initialize the page.