Scenario
An enterprise migrating from SAP BW/4HANA expects:
- Complex ABAP transformations
- Multi-layer staging
- Heavy custom logic
- Deep delta chains
But BDC works differently — it is cloud-native and semantic-driven, not traditional BW-style ETL heavy.
Key Data Flow Limitations in BDC
1️⃣ No ABAP-Based Transformations
Limitation:
- No Start/End/Expert routines like BW
- No custom ABAP coding in transformations
Impact:
- Complex logic must be redesigned
Workaround:
- Use SQL-based transformations
- Push logic to source (e.g., S/4 CDS views)
- Simplify transformation layers
2️⃣ Limited Multi-Layer Staging
Limitation:
- Traditional 3–4 layer LSA++ modeling is discouraged
- Over-staging impacts performance
Impact:
- Cannot replicate classic BW architecture 1:1
Best Practice:
- Use lean architecture
- Minimize intermediate persistence layers
3️⃣ Delta Handling Constraints
Limitation:
- Delta logic depends heavily on source capability
- Custom delta logic is limited
Impact:
- ECC-based sources may need careful extractor design
Mitigation:
- Use ODP-based extraction
- Validate delta consistency during migration
4️⃣ Complex Joins Across Large Domains
Limitation:
- Heavy runtime joins across large datasets can degrade performance
Impact:
- Cross-domain models may slow down
Optimization:
- Pre-aggregate frequently used KPIs
- Avoid unnecessary many-to-many joins
5️⃣ Limited Procedural Logic
Limitation:
- No procedural programming style transformations
- Limited support for deeply nested logic chains
Impact:
- Requires redesign mindset
6️⃣ Governance & Cross-Space Restrictions
Limitation:
- Data access across domains must follow governance rules
- Not everything is freely joinable
Impact:
- Requires clear domain ownership design
Biggest Conceptual Limitation
BDC is not meant to be a traditional ETL-heavy data warehouse. It is designed to be semantic-first and cloud-optimized.
Trying to replicate BW complexity leads to performance and design issues.
Interview-Ready Answer (Short)
Data flow limitations in SAP Business Data Cloud include the absence of ABAP-based transformations, reduced multi-layer staging, limited custom delta handling, and constraints on heavy runtime joins. BDC encourages lean, cloud-native modeling with simplified transformations and semantic-driven design rather than traditional BW-style ETL complexity.
Pro Interview Tip
If asked about limitations, always add:
“However, these are architectural design choices aligned with cloud-native principles rather than technical shortcomings.”
That shows architect-level maturity.
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