Why your ERP is costing you more than you think: the case for purpose-built vendor management

Vendor management is mission-critical – so why are so many organisations trying to run it through a system that wasn't built for it?

If you've ever spent an afternoon chasing down an expired insurance certificate, manually reconciling duplicate vendor records, or waiting days for an approval that should have taken hours, you already know the answer. Your ERP is doing its best. But vendor management isn't what it was designed for.

We've just released a new eBook – Vendor Intelligence: What a purpose-built vendor management system delivers that your ERP can't – and it tackles one of the most common (and costly) decisions procurement leaders in construction, mining, and utilities face: ERP customisation vs. a purpose-built Vendor Management System (VMS).

Here's a preview of what's inside.

The "why add another system?" question

It comes up constantly, and it's a fair one. Fewer systems to manage, a simpler tech stack, no new implementation project. On the surface, using your existing ERP for vendor management looks like the pragmatic choice.

But here's the reality: customising an ERP to handle vendor onboarding, compliance tracking, prequalification, and supplier performance doesn't eliminate complexity – it just buries it. You end up paying for customisation upfront, then absorbing the ongoing cost of a tool that wasn't built for the job: in workarounds, in reduced productivity, and in the risks that slip through the cracks.

The eBook walks through this trade-off across three lenses – functional, financial, and technical – so you can make a clear decision.

A sneak peek: Where ERPs fall short in vendor management

Vendor onboarding and prequalification

In an ERP, vendor onboarding is typically a one-sided, manual process. Data has to be entered by your staff, there's no vendor portal for self-service, and there's little to no automation for routing compliance requirements to the right internal stakeholders (HSEQ teams, procurement leads, project managers).

A purpose-built VMS flips this. Vendors enter their own data through a dedicated portal, risk-based prequalification is tailored to vendor category, and workflows automatically route requirements to the right people. The result? Onboarding that takes days instead of weeks – and far fewer compliance gaps.

Vendor compliance and database management

Keeping on top of compliance documentation – insurance certificates, licences, safety credentials – is one of the most time-consuming parts of vendor management. In an ERP, it's largely manual: tracking expiries in spreadsheets, chasing vendors by email, hoping nothing slips through.

A purpose-built system automates compliance alerts directly to vendors before documents expire, maintains detailed audit trails of every interaction, and gives your team a searchable, filterable vendor database with custom tagging for attributes like Indigenous ownership, risk category, and performance history.

Supply chain visibility and reporting

This is where the gap becomes most visible at an executive level. ERPs often leave data gaps from upstream manual processes, making it difficult to report on compliance, ESG commitments, or cross-project procurement performance without significant effort.

A VMS gives you a single source of truth – accessible across business units, connected to your BI tools and ERP, and built for the kind of holistic visibility that modern procurement leadership demands.

The hidden costs nobody talks about

Implementation cost comparisons between ERP customisation and a purpose-built VMS are actually fairly similar. Where the numbers diverge is in the hidden costs – and these are the ones that tend to make or break the business case.

Think about how much time your procurement and project teams currently spend:

• Searching for vendor information scattered across systems and offline sources
• Chasing approvals manually via email with no visibility into status
• Tracking insurance renewals and distributing compliance documents
• Re-researching vendor capabilities that another project team already knows
• Dealing with non-preferred vendor spend because the system is too cumbersome to follow properly

Now multiply that by every active project site, every business unit, and every week of the year. The eBook includes a practical framework for quantifying these costs – and the numbers are rarely as close as the implementation quotes suggest.

There's also the risk exposure side: compliance failures from unknowingly engaging vendors with expired credentials, fraud risk from weak audit trails, and missed opportunities to meet ESG or local content requirements. These aren't hypothetical. They're happening in organisations that are trying to run vendor management through systems that weren't designed for it.

The best-of-breed architecture argument

One concern IT teams often raise is consolidation: fewer systems, simpler support. It's a reasonable instinct – but it's based on an older model of enterprise architecture.

Modern integration ecosystems have changed the equation entirely. With open APIs, standardised protocols, and low-code/no-code integration tools, connecting a purpose-built VMS to your ERP, BI tools, and project management systems can be done in days. The goal isn't to minimise the number of systems – it’s to ensure clean, accurate, actionable data flows across all of them.

A purpose-built VMS captures complete vendor data at the point of entry through structured workflows and vendor self-service. That data becomes your single source of truth, flowing automatically to where it's needed. Contrast that with an ERP approach, where vendor data is compiled from spreadsheets, email threads, and manual entry across multiple projects – scattered, inconsistent, and unreliable.

One source of vendor truth, feeding multiple systems. That's not complexity. That's good architecture.

So, which should you choose?

The eBook's conclusion is straightforward: if vendor management is core to your operations – and in construction, mining, and utilities, it is – it deserves a tool built for the job.

The question isn't whether you can make an ERP work for vendor management. With enough customisation and workarounds, you probably can. The question is whether that's the best use of your organisation's time, money, and focus.

A purpose-built VMS delivers faster time to value, lower total cost of ownership when hidden costs are factored in, and continuous improvement without internal development effort. An ERP customisation delivers a tool that still wasn't designed for the job – at a cost that compounds over time.

Download the full eBook

Vendor Intelligence: What a purpose-built vendor management system delivers that your ERP can't covers the full comparison in detail – including a practical framework for quantifying your hidden costs and building an internal business case.