Creating SAP Source Systems 
Prerequisites
You have defined the necessary configuration in BI and in the source system.
See also:
Configurations in the SAP Source Systems
Procedure
1. In the source system tree in the Data Warehousing Workbench, choose Create in the context menu of the BI or SAP folder.
2. If the destination already exists for the SAP source system, select the destination.
3. If no destination exists, enter the server name information from the source system.
Application server: pswdf090
System ID: IDF
System number: 90
4. Enter a password for the background user in the source system and confirm this in the next input row. If the user already exists in the source system, enter the valid password.
5. Enter the password that you defined for the BI background user in the Implementation Guide under SAP NetWeaver ® Business Intelligence ® Links to other Systems ® Link between SAP Systems and BW ® Maintain proposal for users in the source system (ALE communication), and confirm.
6. Choose Transfer. You get to the remote login in the source system.
7. Select the relevant clients and logon as a system administrator. First make sure that you have the authority to create users and RFC destinations.
The RFC
destinations for BI and the background users are thus created automatically in
the source system. If the RFC destination already exists in the source system,
check its accuracy. You can test the RFC destination using the function
Test ® Links and Test ® Authorizations. For more information on RFC destinations, see 
Maintaining
Remote Destinations.
User profiles are also mapped automatically. If the user already exists in the source system, check the accuracy of the profile
If it does not already exist, the RFC destination for the source system is now created automatically in BI, with the information read in the source system .
Result
The ALE settings, which are needed for the communication between a BI System and an SAP System, are created in the background with the use of the created destinations. These settings are made in BI as well as in the source system. The BI settings for the new connection are created in BI.
If the new SAP source system has been created, metadata is requested automatically from the source system. The metadata for DataSources is also replicated to BI in the D version.