I got error message in the monitor as following:
Error when sending data request
The request IDoc could not be sent to the source system using RFC.
There is an IDoc in the Warehouse outbox that did not arrive in the ALE inbox of the source system.
Check the TRFC log.
You can get to this log using the wizard or the menu path "Environment -> Transact. RFC -> In Data Warehouse".
Check especially the authorizations for the background user in the SAP BW.
how can i solve it ?