How To Fix UPC202 - Error while calling up RFC

SAP Error Message - Details

• Message type: E = Error

• Message class: UPC - Planning: General Error Messages

• Message number: 202

• Message text: Error while calling up RFC

What causes this issue?

You have selected a function, to execute this the system must set up an
RFC connection to another SAP System. However, setting up this
connection was not successful. The following internal error message was
generated:
"&V1& &V2&"

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?

Inform the system administrator.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UPC202 - Error while calling up RFC ?

  The SAP error message UPC202, which indicates "Error while calling up RFC," typically occurs when there is an issue with Remote Function Call (RFC) communication between systems. This can happen in various scenarios, such as when trying to execute a function module remotely or when there are issues with the configuration of the RFC destination.
  Causes of UPC202 Error
  
  Network Issues: Problems with the network connection between the SAP systems can lead to RFC errors.
  RFC Destination Configuration: Incorrect configuration of the RFC destination in transaction SM59 can cause this error. This includes incorrect connection parameters, such as the target system's IP address, port, or user credentials.
  Authorization Issues: The user credentials used for the RFC call may not have the necessary authorizations to execute the function module.
  Function Module Issues: The function module being called may not exist, may be inactive, or may have been changed in a way that is incompatible with the calling program.
  System Performance: High load on the SAP system or the target system can lead to timeouts and errors in RFC calls.
  Version Compatibility: Incompatibility between different versions of SAP systems can also lead to RFC errors.
  
  Solutions to UPC202 Error
  
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the systems involved. You can use tools like ping or telnet to check connectivity to the target system's IP and port.
  
  
  Verify RFC Destination:
  
  Go to transaction SM59 and check the configuration of the RFC destination.
  Test the connection using the "Connection Test" button to ensure it is working correctly.
  Ensure that the target system is up and running.
  
  
  
  Check User Authorizations: Verify that the user credentials used for the RFC call have the necessary authorizations to execute the function module. You can check this in transaction SU01.
  
  
  Review Function Module: Ensure that the function module being called exists and is active. You can check this in transaction SE37 or SE80.
  
  
  Monitor System Performance: Check the performance of both the calling and target systems. Use transaction SM50 or SM66 to monitor system load and performance.
  
  
  Check for Updates or Patches: Ensure that both systems are updated with the latest patches and support packages, as this can resolve compatibility issues.
  
  
  Review Logs: Check the system logs for more detailed error messages. You can use transaction SM21 to view the system log and ST22 for dump analysis.
  
  
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance.
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SU01: User Maintenance
  SE37: Function Module
  SM21: System Log
  ST22: Dump Analysis
  SM50/SM66: Process Overview
  
  
  
  Documentation: Refer to SAP Help Portal for detailed documentation on RFC and troubleshooting RFC errors.
  
  
  By following these steps, you should be able to diagnose and resolve the UPC202 error effectively.