Creating External Services for a Crystal Report 
Use
You create an external service for a Crystal report based on a master iView. You need not know which master iView is concerned because the master iView is automatically selected.
For a Crystal report, a report definition is created using the Crystal Report designer and is stored in the Knowledge Warehouse. Several queries can be embedded in a Crystal report.
Procedure
To create an external service of the type Crystal report, 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 Crystal report that you can insert directly in a role. Read also
Changing External Services in the Role.