An <add_order> command for a job chain node should work for the same job chain

Current Situation

If an add_order command is configured for a job chain node

<?xml version="1.0" encoding="ISO-8859-1"?>
<job_chain>
    <job_chain_node  state="start" job="job1" next_state="success" error_state="error">
        <on_return_codes >
            <on_return_code  return_code="0">
                <add_order  xmlns="https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin" job_chain="job_chain1"/>
            </on_return_code>
        </on_return_codes>
    </job_chain_node>
    <job_chain_node  state="success"/>
    <job_chain_node  state="error"/>
</job_chain>

where the job chain in the add_order command uses the same job chain then a configuration error is raised:

Z-JAVA-105 Java exception XmlException: java.lang.IllegalArgumentException: com.sos.scheduler.engine.plugins.nodeorder.NodeOrderPlugin <add_order job_chain='JobChain /test/job_chain1'> must denote the own job_chain - In <job_chain_node> (:1:121) <on_return_codes> (:2:26) <on_return_codes> (:2:26) <on_return_code> (:3:45) <on_return_code> (:3:45) <{https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin}add_order> (:4:120) <{https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin}add_order> (:4:120) - caused by -..., method=CallVoidMethodA []

Desired Behavior

An add_order command to the same job chain should be possible.

Maintainer Note

• If you use the same job chain in an add_order command then you have to set an order id too. Otherwise, the current order would be replaced.
  Caused by this conflict a configuration error is reported for which the error messsage was wrong and is now updated with this fix.

  Z-JAVA-105 Java exception XmlException: java.lang.IllegalArgumentException: com.sos.scheduler.engine.plugins.nodeorder.NodeOrderPlugin <add_order job_chain='JobChain:/test/job_chain1'> without attribute id= must not denote the own job_chain - In <job_chain_node> (:1:122) <on_return_codes> (:2:26) <on_return_codes> (:2:26) <on_return_code> (:3:45) <on_return_code> (:3:45) <{https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin}add_order> (:4:120) <{https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin}add_orde..., method=CallVoidMethodA []
  

• If you set an order id too then it works

  <on_return_codes >
        <on_return_code  return_code="0">
               <add_order  xmlns="https://jobscheduler-plugins.sos-berlin.com/NodeOrderPlugin" job_chain="job_chain1" id="order2"/>
        </on_return_code>
   </on_return_codes>