How To Fix L1420 - For the following table entries, conversion problems occurred

SAP Error Message - Details

• Message type: E = Error

• Message class: L1 - Message handling for WM master data

• Message number: 420

• Message text: For the following table entries, conversion problems occurred

What causes this issue?

The system could not convert the data records in the table shown

How to fix this error?

If this problem pertains to productive data, you need to break off at
this point, correct the cause of the error and start the program again.
If you cannot correct the problem immediately, you can continue with
the release change.
However, before you use the Warehouse Management component productively
in this client, you must be certain to correct the cause of the error.
Otherwise, irreparable data loss may occur.

System Response

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 L1420 - For the following table entries, conversion problems occurred ?

  The SAP error message L1420 typically indicates that there are conversion problems with certain table entries, often related to data types or formats that cannot be processed correctly. This error is commonly encountered in the context of logistics and inventory management, particularly when dealing with material master data, stock levels, or similar entries.
  Cause:
  
  Data Type Mismatch: The data being processed may not match the expected data type. For example, a numeric field may contain non-numeric characters.
  Invalid Format: The data may be in an incorrect format, such as date formats or currency formats that do not conform to the expected standards.
  Corrupted Data: There may be corrupted entries in the database that cannot be converted or processed.
  Configuration Issues: There may be issues with the configuration of the system that affect how data is interpreted or converted.
  
  Solution:
  
  Check Data Entries: Review the specific entries that are causing the error. Look for any anomalies in the data, such as unexpected characters or formats.
  Data Validation: Ensure that all data adheres to the expected formats and types. This may involve running validation checks or using transaction codes like SE16 or SE11 to inspect the data directly in the database tables.
  Correct Data: If you identify any incorrect entries, correct them manually or through a data correction program.
  Use Transaction Codes: Utilize transaction codes like MM02 (Change Material) or MB1A (Goods Withdrawal) to re-enter or adjust the problematic entries.
  Check Configuration: Review the configuration settings in the relevant modules (e.g., Material Management) to ensure that they are set up correctly.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide patches or updates.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that can help you navigate and troubleshoot data issues, such as SE16 (Data Browser), SE11 (Data Dictionary), and others.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Documentation: Review SAP documentation related to data management and error handling for more insights into how to resolve conversion issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis or technical team for deeper analysis and troubleshooting.