How To Fix MG146 - The material number 0 is allowed only after internal number assignment

SAP Error Message - Details

• Message type: E = Error

• Message class: MG - Batch input: material master

• Message number: 146

• Message text: The material number 0 is allowed only after internal number assignment

What causes this issue?

You have just created a material using internal number assignment. You
now want to extend it to include other organizational levels. In this
case, the following material number is used in data transfer:
"0 " (zero followed by 17 digits)
Either it was not possible to create the material successfully or your
input file does not have the correct structure. For more information,
see the documentation for the <DS:SIMG.SIMG_CFMENUOLMSSXDA>Data
transfer workbench: material master</> in Customizing for the
<LS>Material Master</>.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MG146 - The material number 0 is allowed only after internal number assignment ?

  The SAP error message MG146 indicates that there is an issue with the material number assignment in the system. Specifically, it suggests that the material number being referenced is "0," which is not valid for the operation you are trying to perform. This error typically occurs when the system is set to use internal number assignment for materials, but an attempt is made to use an external number or an invalid number.
  Cause:
  
  Internal Number Assignment: The system is configured to use internal number assignment for materials, meaning that SAP will automatically generate the material number when a new material is created.
  Invalid Material Number: The material number being referenced is "0," which is not a valid material number in SAP.
  Incorrect Configuration: The configuration settings for material number assignment may not be set correctly, leading to this error.
  
  Solution:
  
  
  Check Material Number Assignment Settings:
  
  Go to the configuration settings in SAP (Transaction Code: SPRO).
  Navigate to Logistics - General > Material Master > Basic Settings > Material Number Assignment.
  Ensure that the settings for material number assignment are correctly configured for your requirements (internal vs. external).
  
  
  
  Create Material with Internal Number:
  
  If you are trying to create a new material, ensure that you do not manually enter a material number. Instead, leave the material number field blank so that SAP can generate it automatically.
  Use the transaction code MM01 to create a new material and ensure that the "Material Number" field is empty.
  
  
  
  Check for User Input Errors:
  
  If you are entering a material number manually, ensure that you are using a valid number that adheres to the format and range defined in your system.
  
  
  
  Review User Authorizations:
  
  Ensure that the user has the necessary authorizations to create or modify materials in the system.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes or documentation that may provide additional insights or fixes related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: MM01 (Create Material), MM02 (Change Material), MM03 (Display Material).
  Material Master Data: Understanding how material master data is structured and managed in SAP can help prevent similar issues in the future.
  SAP Help Portal: The SAP Help Portal provides detailed documentation on material management and error messages.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a technical consultant for further assistance.