Hello there,
i have a problem with vat in odoo.
when i create a product with the vat (7%) i get the following error:
ERROR: UNKNOWN ERROR - check the detailed error for more information
That does look like the ID is 15, I wonder why Odoo is saying it isn’t valid. It looks like Tax is a custom thing that isn’t on my setup. If you manually add that tax ID to a product then fetch that product what does the output look like for the ID?
For science could you also try {{15}} as an expression for the taxes id?