qRFC queue errors are one of the most common issues in SAP EWM, and they can block inbound delivery processing completely.
If queues are stuck in SMQ2, it usually means something failed during data transfer between S/4HANA and EWM.

Step-by-Step Troubleshooting

 Step 1: Check the Queue Error (Most Important)

Go to:

• SMQ2 (Inbound Queue)

 Open the stuck queue and check:

• Error message
• Function module name
• Queue name

✔ This gives the exact root cause

 Step 2: Analyze Error Details

Click on the error → Display details

 Common errors you may see:

• Missing Business Partner
• Product not available in EWM
• Configuration missing
• Authorization issue

 Step 3: Fix the Root Cause

Based on the error:

• Missing BP → Replicate Business Partner
• Missing Product → Extend product to EWM
• Config issue → Correct settings in SPRO

 Always fix the issue before reprocessing queue

 Step 4: Reprocess the Queue Safely

After fixing:

• Go back to SMQ2
• Select the queue
• Click Execute (F8)

✔ Queue should process successfully

 Step 5: Verify in EWM

Go to:

• /SCWM/MON

 Check:

• Inbound delivery created
• Warehouse tasks generated

 Common Causes of qRFC Errors

• Missing master data (BP, Product, Location)
• Incorrect integration settings
• Queue dependency issues
• System dump or short dump
• Lock issues or parallel processing problems

 Real-Time Example

In one project:

• Queue stuck in SMQ2
• Error: Business Partner not found

 Fix:

• Replicated BP using standard program
• Reprocessed queue

✔ Inbound delivery processed successfully

 Best Practices to Avoid Queue Issues

• Regularly monitor SMQ1 / SMQ2
• Ensure master data is always synced
• Avoid manual deletion of queues
• Set up alerts for queue failures
• Test integration scenarios properly

 Quick Tips

• Always check error message first (don’t guess)
• Never reprocess queue without fixing issue
• Use SLG1 for additional logs
• Check dumps in ST22 if needed

💬 Conclusion

qRFC queue errors are usually caused by missing data or integration gaps. Once you identify the root cause in SMQ2, fixing and reprocessing the queue will resolve the issue.