How To Fix MM646 - The material type has changed; select the required views

MM646 - Overview

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 646

• Message text: The material type has changed; select the required views

What causes this issue?

The material you have now entered has a different material type. As a
result, the views displayed in the <LS>Select View(s)</> dialog box
have changed.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

MM646 - Details

• The SAP error message MM646 indicates that the material type of a material has been changed, and as a result, the system requires the user to select the necessary views for the material master record. This typically occurs when a material's type is modified, which can affect the views associated with that material.
  
  Cause:
  
  Material Type Change: The material type has been altered, which can happen due to configuration changes or user actions.
  Missing Views: The views that were previously assigned to the material may no longer be valid for the new material type.
  Data Inconsistency: The system detects that the existing views do not match the requirements for the new material type.
  
  
  Solution:
  To resolve the MM646 error, follow these steps:
  
  
  Check Material Type: Verify the current material type of the material in question. You can do this by navigating to the material master record.
  
  
  Select Required Views:
  
  Go to the transaction code MM01 (Create Material) or MM02