xfa.host.exportData() with dynamic interactive table ignores new rows

Hi,

I have a repeating subform with fields. I fill the form by

xfa.host.importData();

which works perfectly.

I add rows, move rows up and down. All that works.

But:

When I export the data with

xfa.host.exportData("", 0);

then the new rows are not in the output xml.

I also tried

console.println(xfa.datasets.data.saveXML("pretty"));

and there are also only the old rows.

Now I am pretty stunned. How come that the activities of

instanceManager.addInstance(true);

are not mirrored in xfa.data???

How can I get my new rows into my output xml?