A party to the open repo or security lending transaction that has a right to demand for exercise of far leg of the open repo or security lending transaction. This element represents an enumerated list that includes InitialBuyer, InitialSeller, Either, AsDefinedInMasterAgreement. In the default case either party can call for closing open repo transaction, unless otherwise specified. If electing parties are not defined in open repo confirmation, when they are defined by default in the Master Agreement, AsDefinedInMasterAgreement value should be used. Exact buyer/seller related parties, including any third parties who can demand exercise of open repo transactions on behalf of the parties to the trade (calculation agent, executing broker, etc.), can be defined in the relatedParty element (tradeHeader/partyTradeInformation).