Scenario:

Inbound EDI 850 purchase order is received with multiple N1 segments and we need to group like fields together for each respective N1 segment.

Solution:

Each N1 segment is qualified by the following: LW and VN. Instead of qualifying the elements we are going to qualify each segment.
Each qualified segment with be 'N' occurring while the 3rd segment will be the catch-all. The catch-all will be for any segment we are not qualifying. The 'catch-all' segment will only occur once.