How To Fix IO405 - The character strings to be compared (&1 and &2) do not follow each other

SAP Error Message - Details

• Message type: E = Error

• Message class: IO - Plant Maintenance: Object List

• Message number: 405

• Message text: The character strings to be compared (&1 and &2) do not follow each other

What causes this issue?

Program error

System Response

The system does not allow further processing.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IO405 - The character strings to be compared (&1 and &2) do not follow each other ?

  The SAP error message IO405 indicates that there is an issue with the character strings being compared in a certain operation, typically related to the order or sequence of the strings. This error often arises in the context of data processing, where the system expects certain strings to follow a specific order or format.
  Cause:
  The error message IO405 is triggered when the system encounters two character strings that do not follow the expected sequence. This can happen in various scenarios, such as:
  
  Data Entry Errors: Incorrect data input where the strings are not in the expected order.
  Configuration Issues: Misconfiguration in the system settings that define how strings should be compared or ordered.
  Programming Errors: Custom code or enhancements that do not handle string comparisons correctly.
  Data Integrity Issues: Problems with the underlying data, such as missing or corrupted entries.
  
  Solution:
  To resolve the IO405 error, you can take the following steps:
  
  
  Check Input Data: Review the character strings being compared to ensure they are in the correct order and format. Correct any discrepancies found.
  
  
  Review Configuration: If applicable, check the configuration settings related to the process or module where the error occurred. Ensure that the settings align with the expected data structure.
  
  
  Debug Custom Code: If the error arises from custom ABAP code, review the logic for string comparison. Ensure that the code correctly handles the expected order of strings.
  
  
  Data Validation: Implement data validation checks to ensure that the data being processed adheres to the expected formats and sequences before it is compared.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific module or transaction where the error occurred for additional guidance.
  
  
  Contact SAP Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support for assistance. Provide them with details about the error, including the context in which it occurs.
  
  
  Related Information:
  
  Transaction Codes: Depending on where the error occurs, you may want to check specific transaction codes related to the module (e.g., MM, SD, FI).
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide patches or updates.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  
  By following these steps, you should be able to identify the cause of the IO405 error and implement a suitable solution.