BW provides open interfaces or staging BAPIs, to enable the extraction of data and metadata from non-SAP sources at application level.
Interface Properties:
Write interface
Programming language is ABAP
Mass data is not supported.
Execution in background/dialog
Programming knowledge is not required
A DataSource/InfoProvider is required as a prerequisite
The staging BAPIs are currently supported for 3.x DataSources.
More information: Transferring Data Using Staging BAPIs