Source-to-Pay suites promise to unify the entire procurement process — from sourcing through contract management to invoice payment. For many organisations, they deliver on that promise. But there is one area where they consistently fall short: deep supplier relationship management.

This is not a criticism of S2P vendors. It is a structural limitation. S2P platforms are built around events — a sourcing event, a contract event, a payment event. Supplier relationships are not events. They are ongoing, evolving, and full of nuance that does not fit neatly into a workflow stage.

What S2P suites do well

To be fair about the limitation, it helps to be clear about the strengths. S2P platforms excel at:

• Structured sourcing events (RFI, RFQ, RFP) with clear start and end points
• Contract creation, storage, and milestone tracking
• Purchase order processing and three-way matching
• Spend visibility and category analytics
• Compliance documentation at the point of contract award

These are transactional and process-oriented capabilities. They are valuable, and most mid-to-large procurement teams need them.

Where they break down

The relationship layer — what happens between sourcing events — is where S2P suites typically struggle. Specifically:

Supplier scorecards become checkbox exercises. Most S2P platforms include a performance module, but it is usually bolted on rather than built in. Scorecards are static, distributed manually, and disconnected from operational data. The result is an annual exercise that procurement teams dread and suppliers respond to reluctantly.

Corrective actions die in email. When a supplier underperforms, the S2P system logs it. But the follow-up — the corrective action plan, the root cause analysis, the verification that the issue was actually resolved — happens outside the system. There is no closed loop.

ESG and risk data is collected once, not monitored continuously. Sustainability questionnaires and risk assessments are completed at onboarding and then rarely updated. The S2P system has no mechanism to alert the team when a supplier’s ESG position changes or when a risk flag appears mid-contract.

Supplier segmentation does not drive differentiated management. Knowing that a supplier is “strategic” versus “tactical” should change how you manage them — evaluation frequency, communication cadence, development investment. S2P platforms store the segment label but rarely connect it to differentiated workflows.

The composable alternative

The answer is not to replace your S2P suite. It is to complement it with a purpose-built supplier performance management layer that handles what S2P does not.

EvaluationsHub is designed specifically for this role. It connects to your existing ERP or S2P data via integration, and adds:

• Continuous, automated supplier scorecards with weighted KPIs per segment
• Structured corrective action workflows with accountability tracking
• ESG and CSRD compliance monitoring on an ongoing basis
• Supplier self-service portal for document updates and evaluation responses
• Risk alerts triggered by performance trends, not just point-in-time assessments

The result: S2P handles the transactions, EvaluationsHub manages the relationships

This composable approach means each tool does what it was built to do. Your S2P suite runs the sourcing events and processes the contracts. EvaluationsHub keeps the supplier relationships performing between those events — and feeds structured data back into your next sourcing decision.

The suppliers you have under contract today represent significant spend. How well you manage those relationships between contract award and renewal determines whether that spend delivers its expected value — or quietly underdelivers.

Start a free pilot and see how EvaluationsHub complements your existing procurement stack in under a week.