Some CICS® servers do not support all the code pages that are supported by the operating system on which CICS Transaction Gateway is running.
If the code page of an ECI application is different from the code page of the server, data conversion must be performed at the CICS server. This restriction applies for EBCDIC CICS servers such as CICS Transaction Server for z/OS®. For more information, see Data conversion, the CICS server documentation, and the IBM® Redbooks® publication Java™ Connectors for CICS.