FormatableBitSet colList = new FormatableBitSet(2);
colList.set(1); // update first row column 1, the second column
page.update(rh1, partialRow.getRow(), colList);
colList.clear(1);
colList.set(0); // update second row column 0, the first column
page.update(rh2, partialRow2.getRow(), colList);
// verify the update worked.
row1.setColumn(1, 400, REC_004);