public void setSourceCustomDbEngineVersionIdentifier(String sourceCustomDbEngineVersionIdentifier) {
        this.sourceCustomDbEngineVersionIdentifier = sourceCustomDbEngineVersionIdentifier;
    }
<p>
The ARN of a CEV to use as a source for creating a new CEV. You can specify a different Amazon Machine Imagine
(AMI) by using either <code>Source</code> or <code>UseAwsProvidedLatestImage</code>. You can't specify a
different JSON manifest when you specify <code>SourceCustomDbEngineVersionIdentifier</code>.
</p>

@param sourceCustomDbEngineVersionIdentifier
       The ARN of a CEV to use as a source for creating a new CEV. You can specify a different Amazon Machine
       Imagine (AMI) by using either <code>Source</code> or <code>UseAwsProvidedLatestImage</code>. You can't
       specify a different JSON manifest when you specify <code>SourceCustomDbEngineVersionIdentifier</code>.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/CreateCustomDBEngineVersionRequest.java