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This requirement is addressed by z/OS Connect Enterprise Edition V3.0.13 / APAR PH02414:
http://www-01.ibm.com/support/docview.wss?crawler=1&uid=swg1PH02414
It has always been the case that API requester will generate COBOL field lengths according to the maxLength of the field in the schema from Swagger.json. However, there was an internal defect, which was addressed in V3.0.13, where the defaultCharacterMax was not being honoured in some cases. This would be the fix to the problem that seems to be the original cause of this request.