I would like to have the tax field override manually. I know tax field in every window is a virtual column and has column sql i.e., calculated from for example C_OrderTax or C_InvoiceTax table. The reason I want sometimes suppliers tax amount does not match with compiere system calculated amount. As an example, I found suppliers tax amount 34.55 while compiere calculated field is 34.56. But client wants to input 34.56 instead of 34.55.

I would like to know, to implement manual tax, what should be the best way.

Thanks for your suggestions.

you can override the tax on vendor invoices in the invoice line