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states={'draft':[('readonly',False)]}),
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'register_posting_date': fields.date(string="Register posting date for Direct Invoice", required=False),
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'vat_ok': fields.function(_get_vat_ok, method=True, type='boolean', string='VAT OK', store=False, readonly=True),
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'st_lines': fields.one2many('account.bank.statement.line', 'invoice_id', string="Register lines", readonly=True, help="Register lines that have a link to this invoice."),