Missing Values
Missing values are not allowed for the ACTIVITY, _X_, _Y_,
and _SEQ_ variables. Missing values for the SUCCESSOR and ID
variables are ignored. Missing values are not allowed for the
ALIGN= variable if the QUITMISSINGALIGN option is specified; otherwise,
the procedure determines suitable values for the ALIGN= variable
using the topological ordering of the network nodes.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.