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pjs.defineDisplay("display", "subfiled.json", { rrnFields: { sfl: 'RRN' } });
 
// Load subfile grid data here
 
display.ctl.execute();  // display control record
 
// Now process all subfile grid records changed by the user 
display.sfl.readChanged();
while (!display.endOfData()) {
  // Process changed subfile records here
  display.sfl.readChanged();
}