You need to create or modify the DFHCNV table for data conversion to allow the Web User Interface to deal with incoming requests.
A sample copybook is provided in CICSTS31.CPSM.SEYUSAMP called EYU$CNV1. This contains an entry for every language and client codepage combination that is supported as follows:
You should include a copy statement for EYU$CNV1 in the DFHCNV source, for example, the CICS® Web Interface sample, DFHCNVW$. For information about the definitions required for the CICS Web Interface, see the CICS Internet Guide.
Once you have updated your DFHCNV source module, you should assemble and link-edit it using the CICS procedures for maintaining conversion table load modules.
The process used to assemble and link-edit the CICS conversion table load modules must have library CICSTS31.CPSM.SEYUSAMP in the SYSLIB concatenation of the assembler step, or the copy book member must be inserted into the table source member in place of the COPY statement.