Function create_position_reconciliation_venue_order_id 

pub fn create_position_reconciliation_venue_order_id(
    account_id: AccountId,
    instrument_id: InstrumentId,
    order_side: OrderSide,
    order_type: OrderType,
    quantity: Quantity,
    price: Option<Price>,
    venue_position_id: Option<PositionId>,
    tag: Option<&str>,
    ts_last: UnixNanos,
) -> VenueOrderId

The account_id scopes the ID to the venue account, preventing cross-account collisions where the engine would otherwise fall back to ClientOrderId::from(venue_order_id) and conflate orders from different accounts. The ts_last (venue-provided) ensures that successive reconciliation incidents with the same shape get distinct IDs, while the same logical event replayed after restart still hashes the same (venue re-reports identical ts).