Configuring the Pipeline URL in SLD 
To enable load balancing for SAP applications (for example ABAP systems) that retrieve the URL of the AEX business system from the System Landscape Directory (SLD), adapt the pipeline URL registered in SLD.
On the SLD start page (http://<host>:<port>/sld) of your SLD host, choose Business Systems.
Select the business system for the AEX.
On the Integration tab, enter the virtual host name and port of the SAP Web Dispatcher in the Pipeline URL field.
Note
Also adapt sender systems using HTTP based adapters (for example SOAP, HTTP) and ABAP sender business systems using HTTP destinations to the AEX to use the Web Dispatcher host name and port.