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

IST30020 - Overview

• 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