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

MG146 - Overview

• 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.

MG146 - Details

• 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