This is a documentation-based orientation, reviewed on 6 September 2026 against official vendor documentation. Kiia has not run a common benchmark or pilot for the alternatives on this page. The recommendation must be validated in your Microsoft tenant, ERP edition, and approval policy.
Which option fits
Power Automate
Start here when an ERP event can trigger a deterministic flow, the required read and write actions are available, and Teams is the place where a person approves or rejects. Microsoft documents the use of Teams approvals with a custom connector for line-of-business applications.
Copilot Studio
Consider it when people need a conversational agent to find a request, explain its context, collect missing information, or invoke the approval flow as a tool. Copilot Studio adds an interaction and orchestration layer. A fixed approval rule does not require one.
Focused custom development
Use it when the process needs complex long-lived state, an unsupported ERP interface, strict performance or availability controls, proprietary decision logic, or a bespoke daily-use interface. A hybrid can work well: custom code owns state while Power Automate handles the Teams approval and notifications.
n8n as an optional candidate
Consider it when the workflow is API-centric, crosses several non-Microsoft systems, and a technical team can own hosting or a managed instance, credentials, upgrades, monitoring, and recovery. Teams remains the interface and does not determine the choice of orchestrator.
The workflow being compared
Illustrative architecture only. It contains no measured volume, latency, savings, or success rate.
Each option must support the same process:
- An order, quote, purchase request, or master-data change reaches a defined ERP state.
- The integration validates the record ID, current status, amount, currency, and required fields.
- A documented policy selects the approver and prevents duplicate requests.
- Teams presents the minimum context required for a human decision.
- The decision, approver, timestamp, and correlation ID are written to the system of record.
- Missing data, timeouts, conflicting state, and write failures go to an owned exception queue.
Architecture comparison
| Option | Best fit | What must be checked | Operating owner |
|---|---|---|---|
| Power Automate | Deterministic approval; Microsoft 365 administration already exists; ERP has a supported connector, HTTP API, or maintainable custom connector | ERP read/write action, connector class and license, Teams Approvals/Workflows availability, service identity, timeouts, retries, and environment policy | Power Platform owner plus process owner |
| Copilot Studio | A conversation must locate, explain, enrich, or initiate requests; the deterministic flow can be called as a tool | Whether an agent improves the task, knowledge and data permissions, human review, capacity model, and a safe fallback when the agent cannot act | Agent owner, Power Platform owner, and process owner |
| Focused custom development | Complex state, proprietary rules, unsupported interface, strict controls, or a bespoke operational UI | Authentication, ERP contract, hosting, deployment, observability, support response, tests, and full lifecycle cost | Product or engineering owner plus process owner |
| n8n, optional | API-heavy cross-platform workflow; the company has technical operating capacity and wants explicit workflow control | ERP and Teams API behavior, instance and credential ownership, license terms, security hardening, upgrades, scaling, monitoring, and recovery | Integration engineering or platform owner plus process owner |
No option receives a score here. A missing required write action or a data policy that prohibits the transfer rules an option out entirely.
Facts that can change the recommendation
- Does the ERP expose the exact trigger and write action in the company’s edition and region?
- Can a service identity perform the work, or would the flow depend on one employee’s account?
- Is the decision a stable policy, or does it need a conversation and additional evidence?
- Must every approver respond, can approval be delegated, and what happens on timeout?
- Which fields may appear in Teams, and where are attachments stored?
- What prevents a repeated ERP event from creating two approvals or writing the decision twice?
- Who monitors failures, reconciles pending items, rotates credentials, and approves changes?
- What availability and recovery time does the process require?
Minimum validation before a proposal
Use synthetic or approved test data. Confirm one read, one approval, one rejection, one write-back, one duplicate event, one missing-field case, one timeout, and one ERP write failure. A successful flow run is not enough. Check the final state in the ERP to confirm that the business process completed.
Record the edition, environment, connector or API operation, identity, timestamps, correlation ID, retry behavior, exception owner, and result. Only after this check can the team estimate implementation and operating cost for its actual architecture.
Sources and limits
- Microsoft documents Teams approvals with custom connectors and the current native approvals experience in Teams.
- The Microsoft Teams connector reference lists operation-specific requirements and limits that must be checked against the chosen action.
- Microsoft describes Copilot Studio agent flows, including deterministic actions, human approval steps, connectors, and capacity consumption.
- n8n publishes guidance for self-hosting and its security audit; operating an instance remains part of the architecture decision.
These sources establish documented capabilities. They do not establish compatibility with a particular ERP or provide evidence of Kiia’s performance. Our methodology explains the broader selection logic, while the guide to Power Automate, Copilot, and custom development adds platform detail.