The Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) recently completed a joint project to develop a common revenue standard for U.S. GAAP and IFRS to improve revenue recognition practices and to remove inconsistencies and weaknesses in revenue requirements. The updated guidance is contained in the Accounting Standards Codification as Topic 606, "Revenue from Contracts with Customers." Review that guidance to summarize the core principle for recognizing revenue and briefly describe the five steps needed to achieve the core principle. Also, describe how the core principle was not achieved in this situation.