@Add service.h
#define ENABLE_BLOCK_USE_BOOKS_WITHOUT_SKILL

@Find char_item.cpp
CHARACTER::UseItemEx
@Find Second
	case ITEM_SKILLBOOK:
@Find Third
			if (IsPolymorphed())
@Add All Skill Books And Other Books x9 (End of the if block)

#ifdef ENABLE_BLOCK_USE_BOOKS_WITHOUT_SKILL
			if (!GetSkillGroup())
			{
				ChatPacket(CHAT_TYPE_INFO, LC_TEXT("You cant read skill book beacuse you dont choise skill group."));
				return false;
			}
#endif