code: public void setCostAdjustment(com.google.api.ads.admanager.axis.v201811.CostAdjustment costAdjustment) {
          this.costAdjustment = costAdjustment;
      }
docs: Sets the costAdjustment value for this ProposalLineItem.
  
  @param costAdjustment   * The cost adjustment applied to the {@code ProposalLineItem}.
  This attribute is
  optional and default value is {@link CostAdjustment#NONE}.
  <span class="constraint Applicable">This attribute is applicable when:<ul><li>using
  programmatic guaranteed, using sales management.</li><li>not using
  programmatic, using sales management.</li></ul></span>
  <span class="constraint ReadOnly">This attribute is
  read-only when:<ul><li>using programmatic guaranteed, using sales
  management.</li></ul></span>