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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message MM646 - The material type has changed; select the required views ?

  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 (Change Material).
  Enter the material number and select the new material type.
  The system will prompt you to select the required views based on the new material type.
  Choose the views that are relevant for the new material type and complete the necessary data entry.
  
  
  
  Save Changes: After selecting the required views and entering the necessary data, save the changes to the material master record.
  
  
  Review Configuration: If the material type change was unintentional, review the configuration settings in the SAP system to ensure that material types are being managed correctly.
  
  
  Related Information:
  
  Material Types: Different material types in SAP (e.g., raw materials, finished goods, trading goods) have different views and data requirements.
  Views in Material Master: Common views include Basic Data, Purchasing, Sales, Accounting, and Storage.
  Authorization: Ensure that you have the necessary authorizations to change material types and views in the material master.
  Documentation: Refer to SAP documentation or help files for detailed information on material types and their associated views.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP Notes for any known issues related to this error message.