3335464 - DTP fails with error "Duplicate data record RSDMD 191"

Following error may occur when executing DTP (Data transfer process):

"&1 : Data record 1 ('& ') : Duplicate data record" "RSDMD 191"

Diagnosis

    There are duplicates of the data record 1 & with the key '& &' for
    characteristic &1.

SAP NetWeaver BW

Update terminated in accordance with error handling setting, RSM2715, Error in substep, RSBK231, Data package processing terminated, RSBK229, RSPC009, Previous request (ID &) has status 'red', Exception CX_RSBK_REQUEST_LOCKED logged, RSDMD191 , KBA , BW-WHM-DST-PC , Process Chains , Known Error