Hi,
if it is the full for PSA you delete the total data then load it again.
in process type use while designing the process chain - "delete the overlapping request form the PSA".
if you add the above option it will delete the existing request and new load will take.
above option use only for the if it is the full load.
2. delete the cahge log table data for the DSO - if you required.
search on the google " house keeping activity in sap bw"
Thanks,
Phani.
