One problem with running the old legacy system in parallel with the new ERP system is that this can lower the effort and cost required to operate the system.

Question

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Running the old legacy system in parallel with the new ERP system can increase effort and cost required to operate the system, as it requires additional resources, maintenance, and coordination to ensure data consistency between the two systems. This can also create confusion and inefficiencies among employees who are required to use both systems.

One Problem with Running the Old Legacy System in Parallel