Keeping track of MRO inventory (ordering, stocking, min/max management, inventory turns, and consumption) is one of the fastest ways to accelerate your ROI on a CMMS implementation. Many companies and organizations keep track of the MRO inventory in their ERP system. This is primarily due to the legacy purchasing process management policies. However, there are many other things to consider regarding inventory management.
David Berger of Plant Services wrote an excellent article on this topic titled to "To CMMS or to ERP?" The read is well worth your time. As the article points out, not using your EAM/CMMS for MRO inventory control causes missed opportunities.
Let me know how you tackle CMMS inventory management.