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Locking and Deleting Send Requests 
Use
You can use the following methods to delete, lock and then unlock a send request, as well as to instantiate a persistent send request.
DELETE
You use this method to delete a send request. See
Reorganization of Send Requests.
ENQUEUE and DEQUEUE
You use these methods of the class CL_BCS to lock and unlock the send request.
You should lock the send request and react to any other locks before changes are made, if it is possible in your application scenario for several processes to access and change a send request at the same time. Generally a send request will be accessed from an application document. If a lock concept already exists for the application document, it may not be necessary to lock the send request additionally.
GET_INSTANCE_BY_OID
You can use this method to reinstantiate a persistent (stored in the database) send request.
Import parameters
I_OID Object ID of the send request
RESULT Send request that was reinstantiated (reference to an instance of the class CL_BCS)