Message SAP /BEV2/EDMESS1302 - First delete units in the master data of tax type &1

Diagnosis You tried to hide a field of the ED master data dialog that stillcontains data. System Response Hiding this field is not allowed. Procedure First remove the values in the ED material master at client level fortax type &v1&: (Material Master->Basic Data 1->Excise Duty->Client orusing transaction MM02)