You can assign external service specifications to the operations of a task list. From Release 4.6A, you can also assign internal service specifications to an operation. The operation control key determines whether a service package will be interpreted as internal or external.

You do not need to maintain the purchasing data for operations which have an internal control key. The operation control key must provide for "Service" for operations to which you would like to assign service packages. If internally processed operation or internally processed operation/external processing possible are allowed entries in the external processing field, then service packages for internal processing are allowed.