Traceability is an intrinsic part of aircraft maintenance. A large component such as the flapperon should be easily traceable. For your information, all components from split pins to the largest components can be traced and should be recorded by batch number and also approved with the relevant EASA Form 1 FAA 8320 attached before any component is fitted. If these forms are not present or there is no way to trace the part then it is not fitted.