Organizations adopting Enterprise Resource Planning (ERP) are also adopting standard ERPvendor- specific process models for engineering their requirements. Making successfully a live process out of such a model is hard. Maturity assessment frameworks can help ERP adopters identify and understand those practices which help their ERP processes succeed and those which do not. This paper deploys a Requirements Engineering maturity model to examine variations in instantiations of a standard ERP RE process. We draw on our previous results and our lessons learnt from eight years of experience in using ERP RE processes.