public String getExpectedReferenceId() {
        return this.expectedReferenceId;
    }
<p>
Assessment identifier of a previous assessment of the same application version. Resilience Hub uses the previous
assessment (associated with the reference identifier) to compare the compliance with the current assessment to
identify drifts.
</p>

@return Assessment identifier of a previous assessment of the same application version. Resilience Hub uses the
        previous assessment (associated with the reference identifier) to compare the compliance with the current
        assessment to identify drifts.
aws-java-sdk-resiliencehub/src/main/java/com/amazonaws/services/resiliencehub/model/ComplianceDrift.java