Software Product Lines have been established as one of the best ways to promote reuse. Enterprise Resource Planning (ERP) are systems composed of a set of functional modules, whose implementation involves their configuration and customization in order to satisfy a customer's needs. This paper focuses on integrating both concepts by viewing an ERP as an SPL by proposing an approach to extract an SPL from an existing ERP. To this end, we conducted an exploratory study of the Odoo ERP suite, illustrating how our approach is applied. As a result, we could recover the ERP domain artifacts and we could derive ERP implementations. Although the proposed approach was able to configure ERP implementations, we found that it cannot be used to customize assets or to define reusable assets not yet considered as part of the existent ERP.