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tell me nothing about replace the existed record or make a new copy: This works correctly for me in 3.14. The first step in troubleshooting

when I try to import a duplicate record from z39.50, koha 3.14 doesn't the issue is probably to double check your record matching rules.

hi, thanks for the reply: what do you mean by "record matching rules"?

Assuming you are importing records using the "Stage MARC records for import" process, record matching rules set the criteria by which an imported record is checked against existing records to check for duplicates: http://manual.koha-community.org/3.12/en/catadmin.html -- Owen -- Web Developer Athens County Public Libraries http://www.myacpl.org