The sys.fh.maint program uses the following code
to tell sys.prreset.type to position itself below
FILENAME.
type = sys_prresettype(
sys.get_dfrow(FILENAME),
sys.get_dfcol(FILENAME)-1);
Note:
sys_prresettype() is a global PCL that pushes sys.prreset.type
passing the row and col as alpha strings.