onValueChange.js

import("system.neon");
import("Product_lib");
import("system.vars");

if(vars.get("$sys.operatingstate") == neon.OPERATINGSTATE_NEW || vars.get("$sys.operatingstate") == neon.OPERATINGSTATE_EDIT)
{
    ProductUtils.presetPriceAndVat(vars.get("$field.PRODUCT_ID"), vars.get("$field.VAT"), vars.get("$field.PRICELIST"), vars.get("$this.value")
        , vars.get("$field.CURRENCY"), vars.get("$field.FROMQUANTITY"), vars.get("$field.PRICE"));
}