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ERP system vary from industry to industry. Therefore, providing an answer that could fit all possibilities and industries is very challenging, almost impossible. However, instead of providing a recipe, I would like to suggest that you ask, before implementation, what are their expectations? what outcomes are they expeting? what do they want to achieve? ....
Gede Rasben Dantes and and Zainal A. Hasibuan wrote a research in2010 on "Measurements of Key Success Factors on Enterprise Resource Planning (ERP) Implementation" (http://www.ibimapublishing.com/journals/IBIMABR/ibimabr.html). Perhaps, you could benefit from the insights of this research paper and come up with a suitable solution to your particular industry/situation.
Hope this answer is of some assitance to you.