Using same account for tax than invoice breaks amount computation

This should be forbidden like we forbid for invoice line.

assigned to @ced

added accounting type::behavior + 1 deleted label

See https://www.tryton.org/~irclog/2022-01-19.log.html#t15:01-29

added 1 deleted label and removed 1 deleted label

New review366571002 at https://codereview.tryton.org/366571002/#ps387731004

New changeset c06071662b82 by Cédric Krier in branch 'default':
Prevent using the same account on tax than invoice
https://hg.tryton.org/modules/account_invoice/rev/c06071662b82

added 1 deleted label and removed 1 deleted label

closed

New changeset b1e2afedd5b0 by Cédric Krier in branch 'default':
Prevent using the same account on tax than invoice
https://hg.tryton.org/tryton-env/rev/b1e2afedd5b0

New changeset 01b9a0d65df8 by Cédric Krier in branch '6.2':
Prevent using the same account on tax than invoice
https://hg.tryton.org/modules/account_invoice/rev/01b9a0d65df8

New changeset a877caf351d0 by Cédric Krier in branch '6.0':
Prevent using the same account on tax than invoice
https://hg.tryton.org/modules/account_invoice/rev/a877caf351d0