Automatic Data Upload with PSA Scanner 
If you have demand-related data that does not come in files but is sent directly to SAP NetWeaver Business Warehouse (SAP NetWeaver BW), you can use the Persistent Staging Area (PSA) scanner. This method is useful for uploading data that has been collected and transformed by a tool to fit SAP Demand Signal Management interfaces. The preferred tool is SAP Data Services.
A new delivery is processed as follows:
The system identifies the data delivery agreements that you defined in Customizing for this method of uploading data.
The system scans the Service Delivery PSA of the data delivery agreement, where information about a new data delivery can be found. The Service Delivery PSA is defined by the delivery DataSource attribute and the source system attribute in the Customizing of the data delivery agreement.
If no Delivery DataSource is defined on data delivery agreement, the Delivery DataSource is taken from the General Settings parameter (DELIVERY_INFO_DATASOURCE_NAME, standard value /DDF/DELIVERY) of the Data Upload Customizing.
The Service Delivery PSA assigns a unique delivery ID to each new data delivery.
If the data delivery is complete, the PSA scanner does the following:
Creates process and step instances configured for the corresponding data delivery agreement for the detected data deliveries and sets the status of all the instances to New.
Calls status management to set the statuses of all the detected data deliveries, the corresponding data sets, processes, and steps to Ready.
The process scheduler picks up the processes and steps that have the status Ready and triggers the associated process chains to propagate the detected data.
Result
In the Process Monitor, you can monitor the scheduled process, which handles the data upload from the PSA.