You must set up a ConnectionFactory in the J2EE server for each IMS™ transaction accessed through protocol IMSJ2C.
If the callLink element property luwControl is set to CLIENT when you are calling a program from WebSphere® 390, the call fails. The WebSphere 390 connect implementation does not support an extended unit of work.
For other details, see e-business Cookbook for z/OS® Volume II: Infrastructure (SG24-5981-01), which is available from Web site http://www.redbooks.ibm.com.