code: public void setLastReservationDateTime(com.google.api.ads.admanager.axis.v201811.DateTime lastReservationDateTime) {
          this.lastReservationDateTime = lastReservationDateTime;
      }
docs: Sets the lastReservationDateTime value for this ProposalLineItem.
  
  @param lastReservationDateTime   * The last {@link DateTime} when the {@link ProposalLineItem}
  reserved inventory.
  This attribute is read-only.