# Subject initials and DOB conflicts

Study designers can configure a study to require that the combination of subject initials and date of birth be unique within a site or throughout the study. If your study requires unique initials and date of birth only within a site, it is possible to have subjects at different sites with the same combination of initials and date of birth.

If you transfer a subject to a site where another subject exists with the same initials and date of birth, and your study requires unique initials and date of birth at the site, the subject transfer fails. You must change the subject initials to make the combination unique.

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