Response to the following problem:
Prior to 2014, Heberling Inc. excluded manufacturing overhead costs from work in process and finished goods inventory. These costs have been expensed as incurred. In 2014, the company decided to change its accounting methods for manufacturing inventories to full costing by including these costs as product costs.
Assuming that these costs are material, how should this change be reflected in the financial statements for 2013 and 2014?