The initial transformation of a model into another model is only the first step. After the creation of the target model, it may be manually changed and the consistency with the source model may be lost or obscured. Ideally, transformation tools should have a way to check the degree of consistency between the source model and the current version of the destination model. This case presents such a scenario for a small transformation, with an automated mutation tool which will introduce changes that may or may not impact consistency. The aim of this case is to evaluate the speed and verbosity of the inter-model consistency checking in the state of the art.