Coupa, SAP Ariba, Procurify and Jaggaer sell supplier networks, approvals, and spend analytics as a subscription. There is no mature open-source system we will deploy as a straight replacement for that network. Purchase orders, vendors, and receipts can live in ERPNext, which is GPL-3.0, if the company is already going to run it.
What is the honest split?
Own the document: who was asked to supply what, at what price, and whether it arrived. Rent, or simply do not buy, the supplier-discovery network. Most of the companies we see are renting Coupa to approve a PDF. That PDF does not need Coupa.
What does ERPNext not give you here?
A prebuilt catalog of every supplier on earth, and a risk score computed by the vendor. If a customer contract requires that catalog, the subscription stays. We will not invent one.
When is a custom approval flow the actual job?
When the pain is the approval path, not the supplier network. That is automation on top of a record you own, not a second ERP. Business process automation is the page for that job.
What do we hand over?
We select the system, deploy it on infrastructure you control, connect it to the tools you keep, and write the runbook so your own team can operate it. Support after handover is optional. The rest of the map is in software you can stop renting; the engagement behind it is open-source business systems.
Name one process that still needs a person. We will tell you what a one-time build takes.
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