4.6.2.1.2 Originator-ID-Symmetric Field

The "Originator-ID-Symmetric:" field contains an Entity Identifier subfield, followed by an (optional) Issuing Authority subfield, and then an (optional) Version/Expiration subfield. Optional "Originator-ID-Symmetric:" subfields may be omitted only if rendered redundant by information carried in subsequent "Recipient-ID- Symmetric:" fields, and will normally be omitted in such cases.