Remove Skill Book Lycan

[ShadowsPR0 8]

Hi metin2dev community. I have this issue which really bothers me. I got this item 50300 which is a skill book. Everytime i drop one from a metin stone i get a random skill book. My server had lycan before but i removed it. But it does have a chance of giving me a lycan skill book. How can i remove the lycan skill book from here ? 

 

Many thanks !

[Bituse 83]

What about to remove that item from item_shop server client side ?
 

Or Search into  drop list for 50300 and remove it from there?