we have a "weak" relation via tax_code_id
IMHO yes we should (only) have ONE account_invoice_tax line per tax_id (which is the same as in account_invoice_line_tax)
we have a "weak" relation via tax_code_id
IMHO yes we should (only) have ONE account_invoice_tax line per tax_id (which is the same as in account_ invoice_ line_tax)