It looks like it's a Sabre/Travelocity error. The fare rules show:
Fare details for NWUSWEB
Code:
BK CODE
N -
PENALTY
NO PENALTIES. NORMAL REFUND PROCEDURES APPLY
RES/TKTG
SGMTS USING THIS RULE MUST BE CONFIRMED.
SEASONS
NO SEASON RESTRICTIONS APPLY.
BLACKOUTS
NO BLACKOUT RESTRICTIONS APPLY.
FLT APPL
NO FLIGHT RESTRICTIONS APPLY.
STOPOVERS
UNLIMITED STOPOVERS PERMITTED. A STOPOVER OCCURS WHEN THE PASSENGER DOES NOT DEPART AN INTERMEDIATE POINT WITHIN 24 HOURS.
TICKET RESTRICTIONS
IF VALID FOR ADULT FARE THEN THE FOLLOWING SALES RESTRICTION APPLY : ISSUE IN W0H3 TICKETS MUST NOT BE ISSUED: BY PTA
REROUTE
SEE PENALTY.
TRANSFERS
UNLIMITED TRANSFERS AS PERMITTED ON THE ROUTING/MPM.
COMBINATIONS
*** CATEGORY PROCESSING HALTED DUE TO DATA ERROR ***
OPEN RTN
OPEN RETURN ALLOWED BUT CANNOT BE AUTO PRICED/TKTD.
REFUNDS
SEE PENALTY.
CO-TERMINALS
*** CATEGORY PROCESSING HALTED DUE TO DATA ERROR ***
Apparently, it's refundable. And no minimum or maximum stay either. It's also available out of other VS gateways like LAX and SFO for slightly higher.