I am  currently developing an RCP that uses XML-Multiview
I have found this problem. 
If I call setModified(true) on the dataObject, the first time every thing works.
Then I click on the save button and recall setModified(true).
This time I am not able to save unless I go to the Text view and  I press any key

I have found a workaround by extending XmlMultiViewEditorSupport
and adding

@Override
    public void saveDocument() throws IOException {
        super.saveDocument();
        DataObject dataObject = getDataObject();
        if(dataObject.isModified()) {
            dataObject.setModified(false);
        }
    }

I will be grateful if you could fix it
Thanks