Withholding Tax

Hi Friends,

Iam working for US withholding Tax reporting 1099. ,

In Classic Withholding Tax initially we configured 2 company codes say {A and B}.  These company codes are not activated in EWT (Extended withholding tax). Now once I activate this company codes (A & B) in EWT  -  are all open items, cleared items, vendor master data will come and show in EWT? or else any customization required.....Please suggest.

I refereed SCN and SAP Notes.

Thanks

Anil