Logical unit of work (LUW) IDs and message qualifiers can only be used on the JavaGateway that created or assigned them. This is a security feature. It stops programs that are connected to the same CICS® Transaction Gateway from using LUW IDs belonging to another application, or from using its message qualifier to request messages. For example, attempts to get a specific reply to a message from a different JavaGateway will result in an ECI_ERR_NO_REPLY return code.