How To Fix E0748 - IDoc transfer: CPI-C error - error while closing connection

SAP Error Message - Details

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 748

• Message text: IDoc transfer: CPI-C error - error while closing connection

What causes this issue?

The CPI-C command 'communication deallocate' failed.
Return code for the command: &v1&

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

If the error keeps occurring, activate the CPI-C trace functionality.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0748 - IDoc transfer: CPI-C error - error while closing connection ?

  The SAP error message E0748, which indicates a "CPI-C error - error while closing connection" during IDoc transfer, typically arises from issues related to the communication between SAP systems or between an SAP system and an external system. Here are some potential causes, solutions, and related information for this error:
  Causes:
  
  Network Issues: Problems with the network connection between the systems can lead to communication failures.
  Configuration Errors: Incorrect settings in the RFC (Remote Function Call) destination or IDoc configuration can cause this error.
  System Overload: High load on the SAP system or the receiving system can lead to timeouts or connection issues.
  Firewall or Security Settings: Firewalls or security settings may block the communication between systems.
  IDoc Processing Errors: Issues with the IDoc itself, such as incorrect data or format, can lead to connection problems.
  CPI-C Protocol Issues: Problems with the CPI-C protocol used for communication can also trigger this error.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is stable network connectivity between the systems involved. Use tools like ping or traceroute to diagnose network issues.
  Review RFC Destination: Verify the configuration of the RFC destination in transaction SM59. Ensure that the connection parameters are correct and that the connection test is successful.
  Monitor System Load: Check the performance of both the sending and receiving systems. If either system is under heavy load, consider scheduling IDoc transfers during off-peak hours.
  Firewall Configuration: Ensure that firewalls are configured to allow communication on the necessary ports for IDoc transfer.
  Check IDoc Status: Use transaction WE02 or WE05 to monitor the status of IDocs. Look for any errors or issues with the IDocs being processed.
  Review Logs: Check the application logs (transaction SLG1) for any additional error messages or warnings that could provide more context about the issue.
  CPI-C Configuration: If applicable, review the CPI-C settings in the SAP system to ensure they are correctly configured.
  
  Related Information:
  
  Transaction Codes:
  
  WE02 / WE05: Monitor IDocs.
  SM59: Manage RFC destinations.
  SLG1: View application logs.
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to IDoc transfer and CPI-C errors.
  Documentation: Review SAP documentation on IDoc processing and CPI-C communication for best practices and troubleshooting steps.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage SAP support for further assistance, providing them with detailed logs and error messages for analysis.