code: public com.google.api.ads.admanager.axis.v201805.DateTime getLastModifiedDateTime() {
          return lastModifiedDateTime;
      }
docs: Gets the lastModifiedDateTime value for this ProposalLineItem.
  
  @return lastModifiedDateTime   * The date and time this {@code ProposalLineItem} was last modified.
  
  <p>This attribute is assigned by Google when a {@code
  ProposalLineItem} is updated.
  This attribute is read-only.