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Did you underestimate the complexity? Did you limit scope to not go insane? What is the typical size/complexity of a typical using company? Could LIDL have used your software for 500M€, could they have even implemented their completely own solution for that money? Thanks!

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There have been a few very large implementations of ERPNext. If I were to consult Lidl, we would have done a few low risk pilots, starting with their warehouses or back-office.

I would have gone for a federated architecture where each store / warehouse would have its own system that would then be consolidated at higher levels, rather than going for a mega instance with zillions of transaction rows.

There are many interesting things you can do when you have an open source system you can work to your advantage.

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