Tax Classification code at Invoice Line level

Hello,

There is an import of services from UK to Netherlands. While entering a manual invoice if I enter the Tax Classification code(TCC) at Invoice Line Level, the tax is not calculated i.e. the tax is calculated and the same is reversed by Offset Tax. If the TCC is not entered at Invoice Line level then the Tax is calculated without the offset.

I tried to set up the TCC at supplier site level under Tax and Reporting. However the same does not get defaulted while entering an Invoice. Can anyone explain the reason.

Thanks