I need to use in PoS a different tax than the default in system. In PoS I need include tax price. Default tax is set as exclude. How to realize it? 

I tried to change the default customer and use standard mapping with fiscal position but ... without sucess (ir.value settings for pos.order and partner_id did not work).

If I manually set the partner for which the tax is to be mapped with fiscal position ... also mapping did not work.