Creating External Services for a Server Page Application 
Use
You create an external service for a Business Server Page (BSP) based on a master iView. You do not need to know which master iView is concerned because the master iView is automatically selected.
Procedure
If you want to create an external service of the BSP application type, proceed as follows:
The external service is generated based on the master iView.
You now see the finished External Service and can see which properties it has. If necessary, you can overwrite certain properties of the master iView.
Result
You created an external service for a BSP application that you can insert directly in a role. Read also
Changing External Services in the Role.