* Overwrites the current row, always update the given headline.
* <p>
* Returns the row page which has to be filled in subclasses afterwards.
*/
protected Page overwriteCurrentRowPage(String rowHeadline) throws RQLException {
Page pageToOverwrite = currentRowPage;
// it is assumed that method firstRow() was called before
// check, if create or update
if (overwrittenRowsCounter < existingRowsSize) {
// update at least given row headline
setCurrentRowHeadline(rowHeadline);