Since one of the key challenges in managing a mixed application environment is the integration costs, you can reduce them by minimizing the transactional volumes crossing these systems, while allowing less voluminous process to cross application boundaries. For example, transactional purchasing and AP systems – especially when direct materials are involved (that are received into inventory) – are certainly better supported through a common system. Processes like strategic sourcing (excluding high-volume Bill-of-Material based sourcing) and strategic supplier management have much lower workflow volumes, and allow more flexibility in using a best-of-breed vendor (i.e. eSourcing).
Procurement Information Architecture Part 5: Workflow (System of Process) [PRO]
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