WITSML - Day Cost Component Schema AFE number that this cost item applies to. Cost group code. Cost class code. Cost code. Cost subcode. Description of cost item. Cost per cost item, assume same currency. The kind of cost item specified (e.g., rig dayrate, joints casing). Size of one cost item. Number of cost items used that day e.g. 1 rig dayrate, 30 joints casing. Cost for the item for this record. Invoice number for cost item, bill sent to Operator. Purchase order number, provided by Operator. Field Ticket number, issued by service company on location. Is this item carried from day to day? Values are "true" (or "1") and "false" (or "0"). Is this item a rental? Values are "true" (or "1") and "false" (or "0"). An identification tag for the item. A serial number is a type of identification tag however some tags contain many pieces of information. This structure just identifies the tag and does not describe the contents. Serial number. Name of vendor. Vendor number. Name of pool/reservoir that this cost item can be accounted to. Is this an estimated cost? Values are "true" (or "1") and "false" (or "0"). Unique identifier for the cost.