Ive, figured it out , using this : [BUG] Tax isn't auto-applied on the invoices - #13 by UnderDog
Kind of not a top UX but maybe it’ll Help other.
1.Config file v 1.7
Set “LEGACY_CALCULATION=true” in ipconfig.php (comment or delete the second one in the bottom of file).
2.Taxes clear (just in case)
~Delete all taxes and add a new fresh one~ (in my case “TPS+TVQ” at “14.98%”.
3.On my Invoice
->Set “Taux de TVA” to “aucun” or “none”
->Manually add my tax in top right option
Here is results :
So, each futur invoices i’ll create, i got to set up manually my custom taxes. I dont know if its supposed to work like that ?
Tricky but its works BTW.
Thanks!