You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: item_evaluation.rb
    path of file: ./repos/hitobito/app/domain/invoice
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

#  Copyright (c) 2022, Schweizer Wanderwege
    
  def fetch_evaluations
    rows = []
    rows += rows_by_invoice_article

    rows << deficit_row if sum_of_deficitary_payments.nonzero?
    rows << excess_row  if excess_amount.nonzero?

    rows
  end