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Whilst this requirement is valid, based on our current plans and priorities for IBM z/OS Connect Enterprise Edition, it is not likely that this could be implemented in the next 12 months. Correspondingly this requirement is being declined at this point. The requirement will be kept in the RFE system and might be reassessed in the future. You also have an opportunity to resubmit in twelve months time if you wish it to be reconsidered then.
We are looking at ways to better handle "dynamic data" in a fixed structure COBOL world so you input has been useful.
For now please consider using the "defaultCharacterMaxLength" property and/or specifying field lengths in the swagger that describes the API. Both of these will be honoured and help to reduce the size of the structures generated.
It is also worth noting that there have been significant updates to BAQCSTUB since this RFE was raised. If you are still seeing performance issues with larger structures with these new updates please contact IBM Support to help diagnose.
zCEE build toolkit has a parameter "defaultCharacterMaxLength" to change the default size of the string field generated.
https://www.ibm.com/support/knowledgecenter/SS4SVW_beta/facilitating/build_toolkit_prop.html
Set the value smaller than 255, and have a try?