For you who play ML (Master League) and BaL (Become a Legend) on PES2013, centainly need unlock the third slot in equipping item. But in there only unlock two slot. Oh yeh, now i can told you how to unlock that use the tools.
The step like that:
1. Download this tools before, PES2013 ITEM EDITOR
2. Extract file, and then open the program
3. Press OPTION.BIN botton (top), wait until the loading finish.
4. Adjust the amount any way you want
5. Press the Save button (bottom), wait until a message appears Finish -> Close Program
6. Run PES 2013, Load ML (Master League) or BAL (Become A Legend)
7. Since I only play BaL, then I’ll adjust.
8. Go to the “Item” -> “Item List” -> “Consumable Items” -> “Extra Pocket”
9. Finish. The third slot equipping item already unlock
10. Enjoy the game
Thanks for Visit 🙂
Dannu Mertha 
linknya mati mass
link fix, thanks atas commentnya 🙂