code: public void setLineItemType(com.google.api.ads.admanager.axis.v201811.LineItemType lineItemType) {
          this.lineItemType = lineItemType;
      }
docs: Sets the lineItemType value for this LineItemSummary.
  
  @param lineItemType   * Indicates the line item type of a {@code LineItem}. This attribute
  is required.
  
  The line item type determines the default priority
  of the line item. More information can be
  found on the <a href="https://support.google.com/dfp_premium/answer/177279">
  Ad Manager Help Center</a>.