How To Fix COM_PRODUCT_CUSTMSG020 - Check-digit in GTIN &1 (unit of measure &2) is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: COM_PRODUCT_CUSTMSG - Product: Customer-Specific Messages

• Message number: 020

• Message text: Check-digit in GTIN &1 (unit of measure &2) is invalid

What causes this issue?

The check digit (last digit) of the GTIN you used is not correct. It is
used to check that the character string preceding it does not contain
any errors and therefore ensures data integrity. The system uses a
predefined algorithm to check this last digit.

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?

Correct the check digit.

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 COM_PRODUCT_CUSTMSG020 - Check-digit in GTIN &1 (unit of measure &2) is invalid ?

  The SAP error message COM_PRODUCT_CUSTMSG020 indicates that there is an issue with the check-digit of a Global Trade Item Number (GTIN) for a specific unit of measure. This error typically arises when the GTIN provided does not conform to the expected format or validation rules, particularly regarding its check-digit.
  Cause:
  
  Invalid GTIN Format: The GTIN may not be in the correct format (e.g., it should be 8, 12, 13, or 14 digits).
  Incorrect Check-Digit Calculation: The check-digit is calculated using a specific algorithm (usually the Modulo 10 algorithm). If the GTIN is incorrect, the check-digit will not match the expected value.
  Data Entry Errors: There may have been a typographical error when entering the GTIN.
  Outdated or Incorrect Data: The GTIN may not be registered correctly in the system or may have been changed without updating the relevant records.
  
  Solution:
  
  Verify GTIN: Check the GTIN for accuracy. Ensure it is the correct number and in the proper format.
  Recalculate Check-Digit: Use the Modulo 10 algorithm to recalculate the check-digit for the GTIN. Ensure that the last digit of the GTIN matches the calculated check-digit.
  Update Records: If the GTIN is incorrect in the system, update it with the correct GTIN that has a valid check-digit.
  Consult Documentation: Refer to the relevant SAP documentation or guidelines for GTINs to ensure compliance with the required standards.
  Contact Support: If the issue persists after verifying the GTIN and recalculating the check-digit, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  GTIN Formats: GTIN can be represented in various formats, including GTIN-8, GTIN-12, GTIN-13, and GTIN-14. Each format has specific rules regarding its length and structure.
  Check-Digit Calculation: The check-digit is calculated using the following steps:
  
  Starting from the right, assign weights of 1 and 3 alternately to each digit.
  Sum the weighted values.
  Calculate the check-digit as the smallest number that, when added to the sum, results in a multiple of 10.
  
  
  SAP Modules: This error may be encountered in modules related to materials management, logistics, or sales and distribution where GTINs are used for product identification.
  
  By following these steps, you should be able to resolve the error and ensure that the GTIN is valid for use in your SAP system.