code: public com.google.api.ads.admanager.axis.v201811.ProposalLineItem getProposalLineItem() {
          return proposalLineItem;
      }
docs: Gets the proposalLineItem value for this ProspectiveLineItem.
  
  @return proposalLineItem   * The target of the forecast if this prospective line item is
  a proposal line item.
  
  <p>If {@link ProposalLineItem#id} is null or no proposal
  line item exists with that ID,
  then a forecast is computed for the subject, predicting
  what would happen if it were added
  to the network. If a proposal line item already exists
  with {@link ProposalLineItem#id},
  the forecast is computed for the subject, predicting
  what would happen if the existing proposal
  line item's settings were modified to match the subject.
  
  <p>A proposal line item can optionally correspond
  to an order {@link LineItem}, in which case,
  by forecasting a proposal line item, the corresponding
  line item is implicitly ignored in the
  forecasting.
  
  <p>Either {@link #lineItem} or {@link #proposalLineItem}
  should be specified but not both.