As below this tests has Batch Order Option set to True yet in KMIP 2.X this value defaults to true.
And since this is not a mandatory test case this element does not have to be sent by the client during this test.
RequestMessage>
<RequestHeader>
<ProtocolVersion>
<ProtocolVersionMajor type="Integer" value="2"/>
<ProtocolVersionMinor type="Integer" value="1"/>
</ProtocolVersion>
<ClientCorrelationValue type="TextString" value="TC-REKEY-5-21 step=2"/>
<BatchOrderOption type="Boolean" value="true"/>
<BatchCount type="Integer" value="4"/>
</RequestHeader>