d.beginTrans();
d.setFieldValue(1, 1, ValueFactory.createValue("a"));
d.deleteRow(0); //0
d.setFieldValue(0, 1, ValueFactory.createValue("b"));
d.commitTrans();
d = (AlphanumericDataSource) ds.getDataSource(dsName);
d.start();
assertTrue(((BooleanValue)d.getFieldValue(0, 1).equals(ValueFactory.createValue("b"))).getValue());
d.stop();