SAP Message RSDMD191 - &1 : Data record &2 ('&3') : Duplicate data record

Diagnosis
There are duplicates of the data record &2& with the key '&3&' forcharacteristic &1&.

Procedure
If this message appears during a data load, maintain the attribute inthe PSA maintenance screens. If this message appears in the master datamaintenance screens, leave the transaction and call it again. Thisallows you to maintain your master data.