Create new MWST Output tax with manual Input of value

Hi,

I'm currently setting up a new interface to another system - target is to create a sales order via BAPI.

In order to avoid rounding differences I would like to copy the aggregated values from the interface directly into the order.

E.g.

Sales price 1 PCE= 5 €

20 PCEs sold

Sales price in total = 100€ --> copy to BAPI

Net price in total = 80€ --> copy to BAPI

Output tax = 20€ --> copy to BAPI

Normally I would start with the net price per one piece and then let the system calculate the tax automatically.

In this case we have a lot of prices that end with .99 and would cause rounding differences as mentioned before.

Is there anyway to set up a manual tax condition (that doesn't do any kind of calculation), but still get a tax code at the end?

Thanks a lot in advance for your help!