A Mantis Project A was imported. All Custom fields from Mantis were created automatically in JIRA.
When I import the Mantis Project B, which has nearly the same custom fields as project A, the import wizzard (step3/7) lists all fields once again, and the fields are created once again in JIRA. So after the import I have two fields with the same name (for all the custom fields) in JIRA. How can I avoid this? Can I influence the mapping of the fields?
One more hint:
I'm not sure that the fields imported via project A haven't been edited (e.g. added a description, the name is unchanged). Could this be the problem for the defective mapping?
This is because JIRA Importers Plugin create custom fields scoped for the given project. So next time you imported issues the previous custom fields were not picked up because they had incompatible project scope. This is to avoid overtaking custom fields created for other reasons.
The solution for you would be to make custom fields global before import and then you can limit their scope again (or leave them global).
I agree with Pawel and add some other information: after importing project A you create new custom fields. When you import project B you must map the fields from Mantis to the given fields in Jira. So you have to map mantis_field_a to jira_field_a. In general all new created custom fields are scoped global. I tried it with jira 5.2.8
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