生产订单执行过程 Production Order Execution Process

Using MRP, planned independent requirements(独立需求计划，如customer order for motorcycle)
in SD become the BOM components required to assemble the motorcycle, that is the dependent
requirements(相关需求计划).

A planned order can be converted to a production order(for material produced in-house) or
a purchse requisition(for procured materials) depending on the strategy chosen.

Production orders go through a series of steps including:
1, Production order release (生产订单审核通过并下发)
2, Goods issue (领取零部件和原材料)
3, Completion confirmation (确认产成品完成)
4, Goods receipt (把产成品运到仓库Inventory中)
5, Order settlement (结算): allocation of calculated costs from the production order to
   another objects (sales order or cost center, for example).
   因为这张生产order在生产过程中累计了一定成本(calculated costs),结算就是把这些累计的成本
   分配到另一些objects中（如：sales order或cost center）