Implementing Microsoft Dynamics NAV or Microsoft Dynamics 365 Business Central as your ERP system is not a turnkey project. Purchasing and implementing an ERP system is not like installing Microsoft Office, for which you run the Setup.exe file and are done with it (based on "next-next-end" philosophy). Implementing an EPR is a process and, with such a process, you need the people that are involved to actively participate in all phases of the implementation. How involved the client's team is will affect the final result of the implementation:

In the preceding diagram, you can see that implementing Microsoft Dynamics NAV or Microsoft Dynamics 365 Business Central on the partner side is a project that can be framed within a larger project, the implementation on the customer side. Depending on the scope of the project, the amount of work...