Why This Question Is Asked
Many companies migrate from:
- SAP BW/4HANA
- SAP ECC
Where ABAP routines, user exits, and custom logic are heavily used.
BDC is cloud-native SaaS, so ABAP flexibility is restricted.
🔍 Core ABAP Restrictions in BDC
🔹 1️⃣ No Custom ABAP Routines
In traditional BW:
- Start Routine
- End Routine
- Field Routine
- Expert Routine
In BDC:
❌ You cannot write custom ABAP code.
✔ Must use SQL-based transformations or data flow logic.
🔹 2️⃣ No Direct Access to SAP Tables
In BW/ECC:
- SELECT queries on transparent tables
- Custom Z-tables
In BDC:
❌ No direct table-level ABAP access
✔ Only exposed data via connectors / models
🔹 3️⃣ No User Exits / BADIs
Traditional systems allow:
- Custom enhancement spots
- Exit-based manipulation
In BDC:
❌ No classic enhancement framework
✔ Use configuration-driven modeling
🔹 4️⃣ Limited Custom Logic Injection
You cannot:
- Call RFC function modules
- Use custom ABAP classes
- Implement complex procedural loops
Instead:
✔ Use SQL pushdown
✔ Use modeling layer logic
✔ Use external processing if required
🔹 5️⃣ No Z-Program Development
On-prem BW:
- Custom ABAP programs
- Background jobs
BDC:
❌ No server-side ABAP execution
✔ Fully managed cloud environment
🧱 Why These Restrictions Exist
Because BDC is:
- Cloud-native SaaS
- Multi-tenant
- Managed by SAP
- Infrastructure abstracted
Allowing custom ABAP would:
- Break scalability
- Impact security
- Increase maintenance complexity
🔄 How to Replace ABAP Logic
| Traditional ABAP | BDC Alternative |
|---|---|
| Start Routine | SQL transformation |
| Expert Routine | Data Flow logic |
| Currency logic in ABAP | Built-in semantic currency conversion |
| Custom join logic | Analytical model design |
🎯 Real Interview Scenario
Q: Your BW system has complex ABAP routines. How will you migrate to BDC?
Answer approach:
- Analyze ABAP complexity
- Categorize logic (simple vs complex)
- Replace simple logic with SQL transformations
- Redesign complex routines using modeling layer
- Avoid 1:1 code conversion
🔥 Interview-Ready Summary
SAP Business Data Cloud does not allow custom ABAP routines or enhancement frameworks because it is a cloud-native SaaS platform. Instead, transformations must be implemented using SQL-based data flows and semantic modeling approaches.
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