The art of ERP implementation stands in matching ERP features with the requirements of an organisation so as to define how to adapt the system and/or the organisation to reach a synergic functioning. A number of approaches have been developed in practice and elaborated in research to solve the issues posed by this matching activity, for example to solve the conceptual mismatch issue or to systematise similarity analysis between different kinds of models such as business process models and system functionality models. One aspect is not often considered in these approaches: it is the opportunity to reuse experience from one ERP implementation project to another. This paper presents a reuse-based requirements elicitation method for ERP integration. The method was developed in an action research approach in a project held in a charity association that wanted to integrate Microsoft's Dynamics NAV.