An oil and gas company is redesigning their oil storage tanks to meet updated international industry standards. A vendor is contracted to perform the work. During the latest inspection, a critical flaw is detected in the tank venting systems. The vendor states that this is a design flaw and that they notified the team lead three weeks ago to inspect the tanks, but they did not perform the inspection. The vendor kept working, using the designs they were given, to meet the next milestone. The team lead says the inspection was not on the schedule