List Time Off Policy Versions

OData filter expression applied to the policy's versions. Supported operators: eq (equals, use eq null to match NULL), ne (not equals, use ne null to match NOT NULL), lt (less than), le (less than or equal), gt (greater than), ge (greater than or equal), in (value in list), and (combine clauses). Not supported: or, not, parenthesized grouping. Filterable fields: versionId (matches the version id), effectiveDate, status. Examples: status eq 'ARCHIVED', effectiveDate ge '2026-01-01', versionId in (10, 11). Note that a version with no effective date stores a zero date rather than NULL, so effectiveDate eq null never matches.