Hi @Keisuke Nagata ,
As it deals with the tables data, you should give the import access to only required user and task should be performed by migration team that way data is validated and secured in the system.
If you want user's should have the access then check the import set and transform maps role
(like import_admin, import_set_loader)access and assign those roles to those users and they will be able to load the data in sevicenow.
See the below post
Which role is required to run Field Map script of Transform Map.
Thanks,
Bhimashankar H
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