Scenario
An enterprise is migrating from:
- SAP BW/4HANA
- Legacy SAP ECC
- Custom EDW layers
To SAP BDC.
Major Migration Challenges
1️⃣ Complex Custom Logic (ABAP Routines)
Challenge:
- Heavy ABAP transformations
- Custom Z-objects
- Start/end routines
Mitigation:
- Redesign logic using SQL-based transformations
- Replace ABAP with data flow modeling
- Eliminate redundant custom logic
- Use SAP-delivered harmonized KPIs where possible
2️⃣ KPI Reconciliation Issues
Challenge:
- Business reports mismatch between BW and BDC
- Different aggregation logic
- Currency conversion differences
Mitigation:
- Parallel run strategy
- KPI validation workshops with business
- Use standardized semantic definitions
- Document calculation logic clearly
3️⃣ Data Volume & Performance
Challenge:
- 5–10 years of historical data
- Large fact tables
- Slow dashboard performance
Mitigation:
- Archive cold data
- Use incremental loads
- Partition data
- Pre-aggregate high-usage KPIs
4️⃣ Integration Complexity (ECC vs S/4)
Challenge:
- ECC lacks CDS views
- Extractor-based legacy logic
- Inconsistent master data
Mitigation:
- Use ODP/replication strategy
- Clean master data before migration
- Harmonize dimensions early
5️⃣ Change Management & Skill Gap
Challenge:
- BW team mindset (technical modeling heavy)
- Business users resistant to new semantic layer
Mitigation:
- Training workshops
- Co-existence strategy
- Start with high-impact quick wins
- Demonstrate AI & real-time value
6️⃣ Governance & Security
Challenge:
- Role redesign
- Data access reconfiguration
- Cross-domain data sharing
Mitigation:
- Implement federated governance model
- Define domain ownership
- Standardize role-based access early
Recommended Migration Strategy
✅ Phase 1 – Assessment
- Identify active models
- Eliminate redundant objects
- Complexity scoring
✅ Phase 2 – Co-Existence
- Run BW and BDC in parallel
- Migrate new use cases first
✅ Phase 3 – Rebuild with Semantics
- Replace custom KPIs
- Leverage SAP-delivered content
- Simplify architecture
✅ Phase 4 – Optimization
- Performance tuning
- Governance stabilization
- Decommission legacy layers
Biggest Mistake to Avoid
❌ Trying to replicate BW 1:1 inside BDC
BDC is semantic-driven and cloud-native — it should modernize, not duplicate, legacy complexity.
Interview-Ready 30-Second Answer
Migration to SAP Business Data Cloud typically faces challenges around custom ABAP logic, KPI reconciliation, data volume, integration complexity, and change management. The best mitigation strategy is a phased co-existence approach, early KPI harmonization, elimination of redundant custom logic, and leveraging SAP-delivered business semantics instead of recreating legacy BW models.
You can also checkout ebooks for SAP BDC – Quick Revision – using the link :
Part 1 : https://topmate.io/vartika_gupta11/1954785
Part 2 : https://topmate.io/vartika_gupta11/1956232
Also can schedule a mock interview either by me or my team at topmate for SAP BDC – 35+ Minutes : https://topmate.io/vartika_gupta11/1962923
You can reach out to me or follow my profile for more such helpful content : Vartika Gupta | LinkedIn