Round Tax Globally Feature in OpenERP

In OpenERP, the Tax calculation rounding method in e.g., SO/PO/INV have 2 rounding method.

This can be setup in menu Setting > Configuration > Accounting

1. Round globally, where rounding per line in 5 digits and then round again in 2 digit globally.
2. Round per line, where rounding per line in 2 digits.

I would recommend Rounding globally always. In some very rare case, Round per line can give some digit problem as following,