Every JD Edwards system that has been running for a few years carries an unanswered question: how many of the custom objects developed over time are still fundamentally identical to the Oracle standard from which they derive, and how many have evolved to the point of becoming something entirely different? This question becomes urgent when facing an upgrade, a migration or a customisation audit. In most cases, the answer does not exist — because no one has ever sought it systematically. In this article, I describe how I approach this problem in my work, and the proprietary tool I developed to solve it.