with the same tail and head nodes are prohibited.
PROC NETFLOW checks to ensure there are no such arcs before
proceeding with the optimization.
Introduce a new dummy intermediate node in multiple arcs.
This node must be distinct for each multiple arc.
For example, if some network has three arcs directed from node A
toward node B, then replace one of these three with arcs
(A,C) and (C,B) and
replace another one with
(A,D) and (D,B).
C and D are new nodes added to the network.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.