In the DataSource Maintenance transaction (RSDS), you have selected FIL0 Delta with Afte Images or FIL1 Delta with Delta Images as the delta procedure on the Extraction tab page:

With the FIL0 Delta with After Images procedure, each record to be loaded returns the new status for all characteristics and key figures. The values in SAP NetWeaver BW are overwritten. DataSources with this delta type can write data to DataStore objects and master data tables.

With the FIL1 Delta with Delta Images procedure, the record to be loaded for cumulative key figures only returns the change to the key figure. The extracted data is added in SAP NetWeaver BW. DataSources with this delta type can write data to DataStore objects and InfoCubes.