Hi Ricardo Gross,

If you are using Odoo Enterprise Edition, you can modify your reports using Studio. First, enable Studio mode, then open the report menu and select the specific report you want to modify, such as the Sale Order or Invoice report. Once you've selected the report, click on the field you want to modify, such as the tax field. In the left sidebar under 'Field Properties,' you can add conditions for that field based on your requirements.

If you need to accomplish this through code customization, you can inherit the report template and add conditions. For example:

• For the Sale Order report template: report_saleorder_document: Sale Order report template ID
• For the Invoice report template: report_invoice_document: Invoice report template ID

Hope it helps

Hello @Ricardo Gross

Hope you are doing well

For you to remove the tax column from the reports you could use studio to do so

First of all you need to go to sale order the click studio and then got to reports and select the quotation/order report to edit.

Then click on the tax column to remove it by removing the columns and text fields.

As shown in below screenshots :- 

You could also implement using code, you will need to inherit the reports and mafe the following changes.

Please find code in comment. 

Feel free to contact me if needed

Hope this will help you.

Thanks & Regards,
Email:  odoo@aktivsoftware.com           

Skype: kalpeshmaheshwari

abre el reporte desde Odoo Studio, luego ve al campo que quiere crear la regla, en el menu de la izquierda de Odoo Studio seleccion, Opcionies avanzadas (opciones avanzadas del campo seleccionado) alli podras insertar el códi python para que sea o no visible