How To Fix IST30020 - Customer exit &1 in &2 is faulty. Check the customer exit.

SAP Error Message - Details

• Message type: E = Error

• Message class: IST30 - Contract A/R + A/P - Paying - Dunning - Disconnect..IST/FICA

• Message number: 020

• Message text: Customer exit &1 in &2 is faulty. Check the customer exit.

What causes this issue?

The predefined logical file name IS_T_BLOCK_TELNR should not be
changed.

How to fix this error?

Check the system settings for the specified logical file name and
adjust physical paths if necessary.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IST30020 - Customer exit &1 in &2 is faulty. Check the customer exit. ?

  The SAP error message IST30020 indicates that there is an issue with a customer exit in the system. Customer exits are enhancements that allow you to add custom functionality to standard SAP applications without modifying the original code. This error typically arises when the custom code in the customer exit is either faulty or not functioning as expected.
  Cause:
  
  Faulty Code: The code written in the customer exit may contain syntax errors, logical errors, or may not be compatible with the current version of SAP.
  Missing Implementation: The customer exit may not have been implemented correctly or may be missing entirely.
  Data Issues: The data being processed by the customer exit may not meet the expected criteria, leading to runtime errors.
  Configuration Issues: There may be configuration settings that are not aligned with the expectations of the customer exit.
  
  Solution:
  
  Check the Code: Review the code in the customer exit for any syntax or logical errors. Use transaction SE80 or SE37 to access the relevant function module or enhancement.
  Debugging: Use the SAP debugger to step through the code and identify where the error occurs. This can help pinpoint the exact line or logic that is causing the issue.
  Review Implementation: Ensure that the customer exit has been implemented correctly. Check if all necessary parameters and data structures are being passed correctly.
  Test with Different Data: If the error is data-related, try testing the customer exit with different sets of data to see if the issue persists.
  Check for Updates: Ensure that your SAP system is up to date. Sometimes, issues arise due to incompatibilities with newer versions or patches.
  Consult Documentation: Review any available documentation for the customer exit to ensure that it is being used as intended.
  Seek Help from SAP Support: If the issue persists and you cannot resolve it, consider reaching out to SAP support for assistance.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE80 (Object Navigator), SE37 (Function Module), or SE38 (ABAP Editor) to access and modify the customer exit.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address known issues with the specific customer exit you are working with.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify and resolve the issue related to the IST30020 error message in SAP.