This is quite easy. You just have to specify the attribute max_orders=1
<?xml version="1.0" encoding="ISO-8859-1"?> <job_chain max_orders="1"> <job_chain_node state="100" job="jobsSample_1" next_state="200" error_state="error"/> <job_chain_node state="200" job="jobsSample_2" next_state="success"/> <job_chain_node state="success"/> <job_chain_node state="error"/> </job_chain>