discuss the accounting issues with RSI's product revenue, revenue recognition with regards to irfs 15. please also make recommendations

Revenues During fiscal Year 11 , total product revenue was $18.2 million and maintenance contract revenue was $5.6 million. For the period ended April, Year 12, product revenue was $13.2 million and maintenance contract revenue was $5.2 million. RSI recognizes product revenue when shipment and installation take place. It is RSF's standard practice to request a customer sign-off for any installation work. The installation crew normally gets sign-off on the day of installation. During interim work for fiscal Year 12, it was noted in the audit file that approximately $640,000 of revenue recognized in April, Year 12, related to work installed and invoiced in Aptil, but customer sign-off was obtained only in early May. Such situations did not catch anyone's attention in previous years. RSI explained that it recently hired new service technicians who were unfamiliar with the policy of customer sign-off, and accordingly had to send technicians back to the client days after the installation was completed to get the sign-offs