private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmmigration.v1.ReplicationCycle,
            com.google.cloud.vmmigration.v1.ReplicationCycle.Builder,
            com.google.cloud.vmmigration.v1.ReplicationCycleOrBuilder>
        getPreviousReplicationCycleFieldBuilder() {
      if (previousReplicationCycleBuilder_ == null) {
        if (!(stepCase_ == 3)) {
          step_ = com.google.cloud.vmmigration.v1.ReplicationCycle.getDefaultInstance();
        }
        previousReplicationCycleBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmmigration.v1.ReplicationCycle,
                com.google.cloud.vmmigration.v1.ReplicationCycle.Builder,
                com.google.cloud.vmmigration.v1.ReplicationCycleOrBuilder>(
                (com.google.cloud.vmmigration.v1.ReplicationCycle) step_,
                getParentForChildren(),
                isClean());
        step_ = null;
      }
      stepCase_ = 3;
      onChanged();
      return previousReplicationCycleBuilder_;
    }
<pre>
A replication cycle prior cutover step.
</pre>

<code>.google.cloud.vmmigration.v1.ReplicationCycle previous_replication_cycle = 3;</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CutoverStep.java