https://userapps.support.sap.com/sap/support/knowledge/en/2650043
2650043 - SEM-BCS: UGMDSYNC drop-down lists 'Source' and 'Target' can not be changed | SAP...
When trying to synchronize master data of a characteristic, that is contained in the SEM-BCS data basis, report UGMDSYNC does not find any differences, and the...