Describe the bug

The ecotax is enabled, In the BO > Orders > old order details page > when we try to add a product which has an ecotax, the base is NOK, so the total is NOK, the invoice is NOK

The Edit of a product with Ecotax is NOK too.

Steps to Reproduce

Steps to reproduce the behavior:

0. Go to BO > International > Taxes > Enable "Use ecotax"
   
1. Create an order from the FO with any product
2. Go to BO > Catalog > Products page > Create a new product
   2.1 Tax included = 12€
   2.2 Tax rule = 20%
   2.3 Ecotax (tax incl.) = 5€
   
3. Go to BO > Orders > last order created
4. Add a product
5. Search the last product created
   
6. Click add
7. see the error
   
8. change the status to payment accepted
9. Download invoice
10. see error
    

PS1768 => ok: https://drive.google.com/file/d/12s52BuZBTIUykgD6j4mRTv-5RhD_xtPA/view?usp=sharing
177x => NOK: https://drive.google.com/file/d/1X1F-PonwH9O1CBsm_WfCsUsW8NsXyLux/view?usp=sharing

Additional information

• PrestaShop version: 177x
• PHP version: 7.2

Expected behavior

As the ecotax is included in the price filled by the merchant, the unit prices should be displayed ecotax included
Specs: https://github.com/PrestaShop/prestashop-specs/blob/master/broader-topics/ecotax.md
Note: For the ecotax VAT rate, take into account the one defined in International > Taxes

Technical viewpoint (@jolelievre)

This comment should help you regarding the technical solution that needs to be implemented #22029 (comment) If you have any question don't hesitate to ask me

Status

Waiting for #22228 to be merged