As part of SAP S/4HANA 2021, the following improvements have been made to SAP Master Data Governance in the Materials area of Central Governance, as shown in this demo video:
- Material Number Field Read-Only for Internal Number Ranges
- Improved Performance in SAP HANA-Based Search With Classification
- Fuzziness Threshold for Attributes in SAP HANA-Based Search
- Improved Error Messages for Change Material Type and Base Unit of Measure
- Change of Valuation Category
For more information about these and other MDG features, please see
https://www.sap.com/community/topics/master-data-governance.html 
