SAP : 利用BOM Usage Priority 在開工單時，不同level展不同usage的BOM

1. T-Code : OPL8 (開工單時，不同order type的參數設定，比如此order type用什麼 BOM Application)

2.查詢BOM Application的SelID
          IMG->
          Controlling->
          Product Cost Controlling->
          Product Cost Planning->
          Material Cost Estimate with Quantity Structure->
          Settings for Quantity Structure Control->
          BOM Selection->
          Check BOM Application

3. 在BOM Application設定BOM Usage Prioroty，這裡就會設定如何展BOM，當有多層BOM時，每一層BOM就會依照這裏設定展開
          IMG->
          Production->
          Shop Floor Control->
          Operations->
          Bill of Material Selection->
          Define Prioroties for BOM Usage