If “Records are ordered” check box is not checked then the lines in parent record displays in alphabetical order in both view mode and edit mode.
If it is a child record and “records are ordered” check box is checked, then we can able to move the lines in the particular order on a parent record.
If “records are ordered” check box is checked still the lines in this record displays in alphabetical order in view mode & but in edit mode it displays in order which we have arranged.