Hi Srini,
The report updates the TDS code in document posted against the vendor , where the TDS codes are maintained after processing of these documents.
System will not allowing to make payment unless this report will execute, as the TDS related reocrds are updated in WITH _item Table.
For your secod querry, You can maintain the TDS code and then run this report , If you have maintain both the TDs code in master , report will update both codes there in document. Go to FB02 and remove invoice code and save.
Then process transction through F-53 , system will dedcut TDS.
Regards
Pankaj Pandey