ERP Integration Architecture

ERP systems are the backbone of enterprise operations — finance, supply chain, HR, manufacturing. But they’re also the hardest systems to integrate with. Legacy protocols, complex data models, batch processing windows, and change management that moves at glacial speed. This guide covers practical patterns for connecting modern applications to ERP systems without going insane.

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Integration Patterns

Pattern	Use Case	Latency	Complexity
API Gateway	Real-time queries, modern ERPs	Low (ms)	Low
Middleware/ESB	Protocol translation, routing	Medium	Medium
CDC (Change Data Capture)	Near-real-time data sync	Low (seconds)	Medium
Batch File Transfer	Bulk data exchange (IDOC, EDI)	High (hours)	Low
Event-Driven	Publish ERP events to consumers	Low	Medium-High
RPA	Legacy UI with no API	High	High (fragile)

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Integration Architecture

Modern Applications              Middleware              ERP Systems
┌──────────────┐              ┌──────────────┐        ┌──────────────┐
│ Web App      ├──── API ────▶│              │        │              │
│ Mobile App   │              │  Integration │◀─ RFC ─│  SAP S/4HANA │
│ Analytics    │◀── Events ──│  Platform    │        │              │
│              │              │              │        │              │
│ Data Lake    │◀── CDC ─────│  (MuleSoft/  │◀─ API ─│  Oracle EBS  │
│              │              │   Boomi/     │        │              │
│ CRM          │◀── Batch ───│   Dell)      │◀─ File─│  Legacy ERP  │
└──────────────┘              └──────────────┘        └──────────────┘

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Master Data Management

Data Domain	Source of Truth	Sync Direction	Frequency
Customer	CRM (Salesforce)	CRM → ERP	Near real-time
Product	PLM/PIM system	PLM → ERP → E-commerce	Daily batch
Vendor	ERP (procurement)	ERP → AP system	On change
Employee	HR system (Workday)	HR → ERP → Payroll	On change
Financial	ERP (GL)	ERP → Analytics	Daily close

Data Synchronization

sync_config:
  customer_master:
    source: salesforce
    target: sap_s4
    
    field_mapping:
      - source: Account.Name → target: KNA1.NAME1
      - source: Account.BillingCountry → target: KNA1.LAND1
      - source: Account.Phone → target: KNA1.TELF1
    
    conflict_resolution: source_wins
    
    validation:
      - field: Account.Name
        rule: not_empty
      - field: Account.BillingCountry
        rule: iso_country_code
    
    error_handling:
      retry_count: 3
      dead_letter_queue: true
      alert_on_failure: true

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Anti-Patterns

Anti-Pattern	Problem	Fix
Point-to-point integration	Spaghetti connections, unmaintainable	Integration platform (middleware)
Real-time everything	ERP can’t handle transaction volume	Batch for bulk, real-time for critical only
Bi-directional sync everything	Conflict resolution nightmare	Define source of truth per data domain
Direct database access	Bypasses business logic, breaks on upgrade	Use supported APIs (BAPI, OData, REST)
“Big bang” migration	All-or-nothing risk	Phased migration, run parallel systems

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Checklist

• Integration platform selected (MuleSoft, Boomi, custom)
• Source of truth defined per data domain
• Field mapping documented and version-controlled
• Error handling: retry, dead letter queue, alerting
• Data validation at integration boundary
• Idempotent operations (safe to replay)
• Monitoring: sync lag, error rates, throughput
• DR plan: what happens if integration platform is down?

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:::note[Source] This guide is derived from operational intelligence at Garnet Grid Consulting. For ERP integration consulting, visit garnetgrid.com. :::