how can i change price silk to gold in NPC?

how can i change price silk to gold in NPC?. Any1 show me show i can? I want to change in client too

database: _RefPricePolicyofItem, _RefObjCommon
client: refpricepolicyofitem.txt, itemdataXXXXX.txt

in pricepolicy lines you need to remove the lines for PaymentDevice 4 and 16 and change the line with PaymentDevice 2 to PaymentDevice 1 and change the price (column name "Cost")
in objcommon/itemdata lines change the column "CashItem" to 0 (else the gameserver will throw errors)

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Originally Posted by lemoniscool

database: _RefPricePolicyofItem, _RefObjCommon
client: refpricepolicyofitem.txt, itemdataXXXXX.txt

in pricepolicy lines you need to remove the lines for PaymentDevice 4 and 16 and change the line with PaymentDevice 2 to PaymentDevice 1 and change the price (column name "Cost")
in objcommon/itemdata lines change the column "CashItem" to 0 (else the gameserver will throw errors)

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thanks for your help, i try, i think it very hard for me:(