(Item Code and Classification Operation Instructions 0. Define items: original materials (components) related to production, outsourced parts, remanufactured products, semi-finished products, spare parts, finished products, etc. Item code: The identifier of the item, which is stipulated to be composed of numbers or uppercase English letters (excluding I, O, Z) according to the rules. The same item can only have one encoding, and different items must have different encodings.)