Ultimate Combat adds a few arrows types (UC p.130, http://paizo.com/pathfinderRPG/prd/ultimateCombat/combat/easternArmorAndWeapons.html )
In PCGen they are listed as cost 0.0, weight 0.0
True values are:
Arrow, iron-tipped distance (20) cost 1gp, weight 4lb
Arrow, whistling (20) cost 2gp, weight 3lb
there's also a pair of entries:
"Bamboo shaft (10)" cost 10.0, weight 0.5 [UC]
"Bamboo shaft arrows (10)" cost 1.0 weight 0.5 [UE p.23]
They are 2 entries for the same item, though the 2 books do give the 2 names ... but the cost and weight are for the "... arrows" entry in UE.
Pathfinder core supplements
per 2 comments ago: the single "Arrow (Whistling)" has the weight and cost of 20
Yeah, and I fixed that when I re-resolved the issue.
I now have:
Whistling Arrows (20) TYPE:Ammunition.Resizable.Standard.Arrow COST:2 WT:3 BASEQTY:20 EQMOD:STEEL.WOOD MODS:YES SOURCEPAGE.40
Arrow (Whistling) TYPE:Ammunition.Resizable.Arrow COST:0.10 WT:0.15 EQMOD:STEEL.WOOD
What is incorrect?
incorrect is me not downloading a version per day!
Might I interest you in setting svn or git? A lot easier to test when you can grab updates as they happen. Plus, you don't have to download mbs of repeat, svn or git only grab actual changes. Saves bandwidth and time!