Processing Operations Externally 
With Individual Purchase Order and Service Specifications
If you want to assign an entire order to an external company, you must create an order for this that only contains one operation.

If the Externally processed operation indicator has been set in the External processing field in Customizing for the control key used, a purchase requisition is triggered automatically by the system.
If the Res/PReq indicator has been set in Customizing for Functions and Settings for Order Types ® Define Change Docs, Collective Purc. Req. Indicator, Operation No. Interval, the purchase requisition is triggered immediately. If the indicator is not set, the purchase requisition is not automatically triggered when the order is released.
If you only decide later that an operation should be processed externally and the Res/PReq indicator is not set, you can use the Activate res./purch.req. function to trigger the purchase requisitions. This function can only be executed once in the order. Subsequently, all purchase requisitions are always triggered immediately.
The External Processing Operation screen appears for the first operation or sub-operation selected.
- For operations which you want to create without service specifications, you can, for example, enter components here.
- For operations which you want to create with service specifications, enter the services here.
In addition, make all the entries for the procurement options.

You have the option of defining the data for external processing in the form of default value profiles in Customizing by choosing Functions and Settings for Order Types à Create Default Value Profiles for External Processing. These profiles are dependent on user, plant and order types. They simplify data entry for external procurement of materials and services.
If no
When you have processed all the selected operations and sub-operations, the operation overview screen reappears.
At the point defined in Customizing, the system creates purchase requisitions. You can find the number of the purchase requisition for the operation on the actual data screen for the operation or sub-operation.
See also:
Purchase Orders
Change of Purchase Requisition
MM - Service
Basic Process for the Procurement of Services