Changing Item(s) Tax in POS in different circumstances

Hi there,

I would like to be able to change item(s) Vat in POS when transaction is taking place.

At the moment I have all my items set up at 23% vat

Straight forward selling over the counter works fine and tax is calculated correctly - no problem there.

My issues is when I am selling items as part of service I supply. 

All items included in the service should be taxed at lower rate 13.5 %

I tried the toggle tax function but it changes my Vat to 0

I also tried function taxes in POS - all my Sales Tax Settings are displayed there but once I leave only the 13.5 % turned on only VAT changes to 0.

I would like to be bale to set a different Vat rate to items depending on circumstances.

Am I missing something in configuration/ cashier permissions?

Any advice would be much appreciated.

Many Thanks,

Gosia