In commit 355250d, the domain was adjusted to automatically select the
invoice document type for customers with a RUC and limit others to the
"boleta" document type. This generally holds true, except for export
invoices requiring the 01 document type. This commit addresses the
current restriction, allowing the selection of document type 01 other
than "credit note boleta."
closes odoo/odoo#154511
Related: odoo/enterprise#56465
Signed-off-by: Laurent Smet (las) <las@odoo.com>