IBM Z Software
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Thank you for raising this requirement. It is being closed as a duplicate of existing RFEs 122184 & 112775:
http://www.ibm.com/developerworks/rfe/execute?use_case=viewChangeRequest&CR_ID=122184
http://www.ibm.com/developerworks/rfe/execute?use_case=viewChangeRequest&CR_ID=112775
They cover preserving case and customisation of field names respectively on import to the service interface editor.
Please add your support by voting and/or commenting on them.