adding new item in media.pk2 = crash, also trader bug, help please

I used this guide to add vigors and wolf to NPC Store

http://forum.ragezone.com/f772/relea...r-wolf-801821/

got exactly the same ID numbers, so all i did was just copy and paste, and it didn't work, then i edit media.pk2 files again but this time using the ID numbers that i got from DB and still didn't work.

I tried to edit only RefShopgoods.txt, i got this:

- Adding an existing item in NPC (like a weapon) for example, adding Blade D9 to potion seller in jangan = works
- Adding a non existing item in NPC like vigor or wolf = Client crash (before login screen, just closes, no error msg)

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Also i have a bug with the trader, for example if i buy in Samarkand, and sell right there (doing nothing, just buy and sell in the same npc), i get a 100% profit (i double my gold or maybe more), any solution? Thanks