The trading workflow requires creating matching documents: **Purchase Order** (ordering stock) -> **Goods Received Note** (verifying stock arrivals) -> **Purchase Invoice** (recording supplier payables).
Computerized accounting systems automate stock count adjustments. Processing a Delivery Order debits Cost of Goods Sold and credits Stock inventory tables automatically based on product unit costs.
交易业务流程需要创建匹配的单据：**采购订单 (PO)**（订购库存）-> **收货单 (GRN)**（验证到货数量）-> **采购发票 (PI)**（记录供应商应付款项）。
计算机化会计系统自动执行库存数量调整。处理送货单 (DO) 时，系统根据产品单位成本自动借记销货成本，贷记库存商品表。
Visual concept map explaining the key module topic: 解释该模块核心主题的视觉概念图：
Prompt: 'Write a prompt instructing an assistant to compare the quantities in a purchase order (PO-100) and a Goods Received Note (GRN-200), listing any discrepancies and price mismatch.'
Result: AI compares arrays, generating a variance alert report for the inventory team.
Prompt 提示词： “编写一段提示词，指导助手比较采购订单 (PO-100) 和收货单 (GRN-200) 中的数量，并列出任何差异和价格不匹配情况。”
效果： AI 对比两个数组，为库存团队生成一份差异报警报告。
1. Which document is issued by the warehouse when supplier goods are received and verified? 当收到并核对供应商到货时，仓库会开具哪种单据？
2. Stock quantity levels in database tables are automatically decremented by: 数据库表中的库存数量水平通常会被以下哪项操作自动扣减？
3. What is the primary purpose of a Purchase Order (PO)? 采购订单 (PO) 的主要目的是：
4. Cost of Goods Sold (COGS) is debited when: 销货成本 (COGS) 在何时被借记？
5. Which document is used to record stock returned by a customer? 哪种单据用于记录客户退回的商品？
Task 1: Identify the accounting code type for Cost of Goods Sold in COA range. 任务 1: 确定 COA 范围中销货成本的会计科目大类代码前缀。
Task 2: SQL query to sum total quantity in stock table 'Stock' where ItemID is 'M001'. 任务 2: SQL 查询：对库存表 'Stock' 中 ItemID 为 'M001' 的总数量进行求和。
Task 3: In SQL Accounting, which menu option converts PO to Invoice? 任务 3: 在 SQL Accounting 中，哪个菜单选项可以将 PO 转换为发票？
Match the term on the left with its definition on the right. 将左侧的术语与右侧的定义进行配对。