table names and field

Hi Gurus,

I want to generate a report for tax purposes. In that details would be vendor name, vendor no, cst, tin no. pan no. tax amount, invoice reference no.

Can anyone help me about the table names and field especially i am not getting table name and field name for invoice reference no. Please let me know atlease invoice reference from where we can bring into the report.

Thanks and Regards

Balu