Uncheck this to send the screen field data only when the end user modifies the data. In this case, the unmodified data is lost because the MDT value changes to ON when the user modifies a field.
None - do not place any lines around the field.
L - place a line to the left side of the field.
R - place a line to the right side of the field.
O - place a line over the field.
U - place a line under the field.