The stage of post-adoption of an enterprise system (ES) implementation has been in the focus of recent information systems research. However, a thorough understanding of how users effectively use an enterprise system to complete their tasks is still missing. Prior research has implied that adaptive use is of great importance to facilitate effective use of a system. We investigate adaptive use solutions, which are outside the original system. This behavior is known as workaround. We conduct an interpretive case study to investigate the impact of workarounds and explain why workarounds can lead to an advance in effective use of a standard ES. We expand the theory of effective use with an explanation why workarounds can improve transparent interaction, representation fidelity and informed action via alleviating users’ issues with the surface structure and the faithfulness in representations of an implemented standard ES.