self_reported_ethnicity_ontology_term_id must not allow duplicate HANCESTRO terms when multiple terms are present:
... the value MUST be formatted as one or more comma-separated (with no leading or trailing spaces) HANCESTRO terms in ascending lexical order with no duplication of terms or "unknown" if unavailable.
Context
self_reported_ethnicity_ontology_term_id
must not allow duplicate HANCESTRO terms when multiple terms are present:... the value MUST be formatted as one or more comma-separated (with no leading or trailing spaces) HANCESTRO terms in ascending lexical order with no duplication of terms or "unknown" if unavailable.
See self_reported_ethnicity_ontology_term_id for the full requirements.