The best practice in project management, as per the PMBOK Guide, involves developing a comprehensive procurement management plan. This plan should detail all the necessary procurement activities, timelines, and resources required for the project. Having the client approve this plan ensures that both the project manager and the client have a mutual understanding of the procurement timeline and deliverables, which would prevent the scenario of an unexpected contract duration discrepancy.
: = A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition1.