Enterprise use case · OpenAI + Coupa + SAP
Contract terms against supplier invoices
Rates, renewal clauses and charging conditions sit in documents that finance must reread whenever an invoice looks wrong. Invoice reviewers see specific differences between the supplier charge and the applicable contract terms.
Systems involved
What each system contributes
25 actions
- Chat Completions8
- Files4
- Uploads4
2 actions
- Invoices2
97 actions
- Procurement17
- Invoice10
The SAP-linked contract document is resolved through an authorized API or code step, with access and provenance included in the workflow. The model step runs against the AI provider you choose, including Anthropic, Google Gemini or a model you host yourself. Anything outside a pre-built action runs through an API, protocol or database call, or as Rules + Code in Python, Bash, Go, Java, .NET, PHP, PowerShell or JavaScript/TypeScript, with the same approvals and audit.
Architecture
One governed run
How it starts: A Coupa invoice is released for contract verification against the relevant SAP supplier or procurement context.
Step by step
How the process runs
- 01
Select the applicable agreement
Retrieve the authorized contract document and amendments through the configured SAP document or API interface.
- 02
Read the terms
The selected model extracts rates, units, dates and charging conditions with references to the relevant clauses.
- 03
Compare the charge
Rules calculate numerical differences while the model identifies semantic conflicts, such as a charge excluded by the applicable clause.
- 04
Prepare the review
Present the invoice line, cited contract passage and proposed discrepancy category to the responsible contract or finance owner.
- 05
Apply the decision
A separate workflow step performs the approved invoice hold, correction request or permitted SAP accounting action.
Control
Human decision and exception path
Human decision
A named contract owner resolves ambiguous terms, and the authorized finance owner approves any change to a charge, posting or payment treatment. Model interpretation does not amend the agreement or establish a new contractual entitlement.
Exception path
- Missing amendments or uncertain contract applicability hold the comparison for document review.
- An unreadable clause or unsupported interpretation is marked unresolved rather than converted into a definite finding.
- Invoice or contract changes require a fresh comparison before the earlier decision can be reused.
Evidence
What gets audited
- Contract version, amendments and invoice references.
- Extracted terms, cited passages and comparison calculations.
- Interpretation decisions and named finance approvals.
- Approved destination actions and system responses.
Nexus runs on premises, in private or sovereign cloud, or air-gapped. Credentials stay in the vault, roles decide who can approve, and the execution record stays inside your deployment boundary.
Sovereignty and deploymentRelated
Patterns, connectors and next steps
- Coupa-SAP integration
Integration pattern · Approved invoice data reaches SAP with matching, posting controls and status visibility.
- OpenAI connector
25 pre-built actions
- Coupa connector
2 pre-built actions
- SAP connector
97 pre-built actions
- Compliance evidence
Evidence produced by the work itself.
- Order to cash across CRM, ERP and billing
Another enterprise use case.
FAQ
Questions about this use case
- Does Nexus replace any of these systems?
- No. Each system keeps its own records. Nexus runs the process between them and records each decision.
- How does the run start?
- A Coupa invoice is released for contract verification against the relevant SAP supplier or procurement context.
- What if a step is not covered by a pre-built action?
- The SAP-linked contract document is resolved through an authorized API or code step, with access and provenance included in the workflow. The model step runs against the AI provider you choose, including Anthropic, Google Gemini or a model you host yourself. Anything outside a pre-built action runs through an API, protocol or database call, or as Rules + Code in Python, Bash, Go, Java, .NET, PHP, PowerShell or JavaScript/TypeScript, with the same approvals and audit.
- Does this provide a binding interpretation of the contract?
- No; the model identifies relevant wording and possible discrepancies for the responsible people to decide.
Use case review
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