code: public void setGrossCost(com.google.api.ads.admanager.axis.v201805.Money grossCost) {
          this.grossCost = grossCost;
      }
docs: Sets the grossCost value for this ProposalLineItem.
  
  @param grossCost   * The cost of the {@code ProposalLineItem} in proposal currency.
  It supports precision of 2
  decimal places in terms of the fundamental currency
  unit, so the
  {@link Money#getAmountInMicros} must be multiples
  of 10000. It includes agency commission.
  
  <p>At least one of the four fields {@link ProposalLineItem#netRate},
  {@link ProposalLineItem#grossRate}, {@link ProposalLineItem#netCost}
  and
  {@link ProposalLineItem#grossCost} is required.
  <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>