disable item consume when using skill

[zeroro]

do you know how to use skill without usen an item (ex blue gem on safet wall)

[sader1992]

skill_require_db.txt

// Structure of Database:
// SkillID,HPCost,MaxHPTrigger,SPCost,HPRateCost,SPRateCost,ZenyCost,RequiredWeapons,RequiredAmmoTypes,RequiredAmmoAmount,RequiredState,RequiredStatuses,SpiritSphereCost,RequiredItemID1,RequiredItemAmount1,RequiredItemID2,RequiredItemAmount2,RequiredItemID3,RequiredItemAmount3,RequiredItemID4,RequiredItemAmount4,RequiredItemID5,RequiredItemAmount5,RequiredItemID6,RequiredItemAmount6,RequiredItemID7,RequiredItemAmount7,RequiredItemID8,RequiredItemAmount8,RequiredItemID9,RequiredItemAmount9,RequiredItemID10,RequiredItemAmount10,RequiredEquipment
//

see at the end

RequiredItemID1,RequiredItemAmount1,RequiredItemID2,RequiredItemAmount2,RequiredItemID3,RequiredItemAmount3,RequiredItemID4,RequiredItemAmount4,RequiredItemID5,RequiredItemAmount5,RequiredItemID6,RequiredItemAmount6,RequiredItemID7,RequiredItemAmount7,RequiredItemID8,RequiredItemAmount8,RequiredItemID9,RequiredItemAmount9,RequiredItemID10,RequiredItemAmount10,RequiredEquipment

example of safety wall

from 

12,0,0,30:30:30:35:35:35:40:40:40:40,0,0,0,99,0,0,none,0,0,717,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0	//MG_SAFETYWALL

to

12,0,0,30:30:30:35:35:35:40:40:40:40,0,0,0,99,0,0,none,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0	//MG_SAFETYWALL