Apache should use SSLCertificateChainFile instead of SSLCACertificateFile

ISPconfig uses SSLCACertificateFile for SSL bundle certificates.

The Apache documentation prefers SSLCertificateChainFile:

http://httpd.apache.org/docs/2.4/mod/mod_ssl.html#sslcertificatechainfile

Is there a reason why SSLCACertificateFile is used?