SAP Message UCF7009 - Data already exists for &1 &2

Diagnosis
The current record contains data for the value &V2& of characteristicV1. the system already contains data for this. however, according tothe update mode set in upload method &V3&,existing settings may not be modified.

System Response
Record has errors and will not be saved.

Procedure
If applicable, change the update mode of the upload method or the filebeing uploaded.