A certificate alias is the name given to a CA certificate located in the keystore.
Each entry in the keystore has an alias to help identify it. You may need to use the -alias command-line qualifier when using the keytool utility to work on a specific entry in the keystore.
The certificate alias identifies the alias of a specific certificate in the system keystore that must be used when making an HTTPS connection to the specified URL. This certificate alias is required when the back end requires mutual SSL connectivity. Use the alias of a certificate stored in the SAP Mobile Platform Server keystore.
The "smp_crt" alias identifies the SAP Mobile Platform Server certificate it uses with its HTTPS listeners. As per HTTP conventions, the CN of the generated X.509 certificate should be the fully qualified hostname.domain of the server where SAP Mobile Platform is installed.
Other certificates in the keystore can be user certificates that SAP Mobile Platform uses when other back-end systems require mutual certificate authentication.