How To Fix AG023 - Error in calling up function '&1' in APO server '&2': &3

SAP Error Message - Details

• Message type: E = Error

• Message class: AG - Nachrichten ATP-Server

• Message number: 023

• Message text: Error in calling up function '&1' in APO server '&2': &3

What causes this issue?

A system error or communication error occurred while calling up a
function in the APO server.

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 relevant system administrator or SAP Support.

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 AG023 - Error in calling up function '&1' in APO server '&2': &3 ?

  The SAP error message AG023 indicates that there is an issue when trying to call a function in the Advanced Planning and Optimization (APO) server. The message typically includes placeholders for the function name (&1), the APO server name (&2), and additional error details (&3). 
  Causes:
  
  Network Issues: There may be connectivity problems between the SAP ERP system and the APO server.
  Configuration Errors: Incorrect configuration settings in the APO system or in the connection settings between the systems.
  Authorization Issues: The user may not have the necessary authorizations to execute the function in the APO server.
  Function Module Errors: The function being called may not exist, or there may be issues with the function module itself (e.g., it may be inactive or have errors).
  System Performance: The APO server may be experiencing performance issues, leading to timeouts or failures in processing requests.
  Data Issues: There may be issues with the data being passed to the function, such as missing or incorrect parameters.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the SAP ERP and APO systems. You can use tools like ping or traceroute to diagnose network issues.
  Review Configuration Settings: Verify the configuration settings in both the SAP ERP and APO systems. Ensure that the RFC connections are correctly set up and that the APO server is properly configured.
  Check Authorizations: Ensure that the user executing the function has the necessary authorizations in the APO system. You may need to consult with your security team to verify user roles and permissions.
  Validate Function Module: Check if the function module being called exists and is active. You can do this by using transaction SE37 in the APO system to look up the function module.
  Monitor System Performance: Use transaction ST22 (Dump Analysis) and SM21 (System Log) in the APO system to check for any performance issues or dumps that may indicate underlying problems.
  Review Input Data: Check the data being passed to the function for correctness. Ensure that all required parameters are provided and that they contain valid values.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM37 (Job Monitoring), ST22 (Dump Analysis), and SM21 (System Log) for troubleshooting.
  SAP Notes: Search for SAP Notes related to the AG023 error message in the SAP Support Portal. There may be specific notes addressing known issues or providing patches.
  Documentation: Review the official SAP documentation for APO and the specific function module to understand its requirements and limitations.
  
  If the issue persists after following these steps, it may be necessary to engage SAP support for further assistance.