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Fusion Accounting/models/debit_note.py
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Fusion Accounting/models/debit_note.py
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# Fusion Accounting - Debit Note Creation
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# Copyright (C) 2026 Nexa Systems Inc. (https://nexasystems.ca)
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# Original implementation for the Fusion Accounting module.
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#
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# Extends account.move with the ability to create debit notes from
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# existing invoices. A debit note copies the invoice lines with
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# reversed sign and links back to the original document.
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import logging
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from odoo import api, fields, models, Command, _
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from odoo.exceptions import UserError
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_logger = logging.getLogger(__name__)
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class FusionDebitNote(models.Model):
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"""Extends account.move with debit note creation from invoices.
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A *debit note* is an additional charge issued to a customer or
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received from a vendor. Unlike a credit note (which reduces the
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amount owed), a debit note increases it.
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This implementation:
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- Copies all product lines from the source invoice
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- Creates a new invoice of the same type (not reversed)
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- Links the debit note back to the original document
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"""
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_inherit = 'account.move'
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# =====================================================================
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# Fields
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# =====================================================================
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fusion_debit_note_origin_id = fields.Many2one(
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comodel_name='account.move',
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string="Debit Note Origin",
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copy=False,
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readonly=True,
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index=True,
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help="The original invoice from which this debit note was created.",
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)
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fusion_debit_note_ids = fields.One2many(
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comodel_name='account.move',
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inverse_name='fusion_debit_note_origin_id',
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string="Debit Notes",
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copy=False,
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readonly=True,
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help="Debit notes created from this invoice.",
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)
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fusion_debit_note_count = fields.Integer(
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string="Debit Note Count",
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compute='_compute_debit_note_count',
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)
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# =====================================================================
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# Computed Fields
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# =====================================================================
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@api.depends('fusion_debit_note_ids')
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def _compute_debit_note_count(self):
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for move in self:
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move.fusion_debit_note_count = len(move.fusion_debit_note_ids)
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# =====================================================================
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# Debit Note Creation
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# =====================================================================
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def action_create_debit_note(self):
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"""Create a debit note from the current invoice.
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The debit note is a new invoice document with the same type as
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the original. All product lines are copied. The amounts remain
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positive (this is an additional charge, not a reversal).
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Supported source types:
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- Customer Invoice (out_invoice) → Customer Debit Note (out_invoice)
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- Vendor Bill (in_invoice) → Vendor Debit Note (in_invoice)
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:returns: action dict to open the newly created debit note
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:raises UserError: if the move type is unsupported
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"""
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self.ensure_one()
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if self.move_type not in ('out_invoice', 'in_invoice'):
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raise UserError(_(
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"Debit notes can only be created from customer invoices "
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"or vendor bills."
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))
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if self.state == 'draft':
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raise UserError(_(
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"Please confirm the invoice before creating a debit note."
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))
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# Build line values from original invoice
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line_vals = []
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for line in self.invoice_line_ids.filtered(
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lambda l: l.display_type == 'product'
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):
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line_vals.append(Command.create({
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'name': _("Debit Note: %s", line.name or ''),
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'product_id': line.product_id.id if line.product_id else False,
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'product_uom_id': line.product_uom_id.id if line.product_uom_id else False,
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'quantity': line.quantity,
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'price_unit': line.price_unit,
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'discount': line.discount,
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'tax_ids': [Command.set(line.tax_ids.ids)],
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'analytic_distribution': line.analytic_distribution,
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'account_id': line.account_id.id,
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}))
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# Copy section and note lines for context
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for line in self.invoice_line_ids.filtered(
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lambda l: l.display_type in ('line_section', 'line_note')
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):
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line_vals.append(Command.create({
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'display_type': line.display_type,
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'name': line.name,
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'sequence': line.sequence,
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}))
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if not line_vals:
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raise UserError(_(
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"The invoice has no lines to copy for the debit note."
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))
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debit_note_vals = {
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'move_type': self.move_type,
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'partner_id': self.partner_id.id,
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'journal_id': self.journal_id.id,
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'currency_id': self.currency_id.id,
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'company_id': self.company_id.id,
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'invoice_date': fields.Date.context_today(self),
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'ref': _("DN: %s", self.name),
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'narration': _("Debit Note for %s", self.name),
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'fiscal_position_id': self.fiscal_position_id.id if self.fiscal_position_id else False,
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'invoice_payment_term_id': self.invoice_payment_term_id.id if self.invoice_payment_term_id else False,
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'fusion_debit_note_origin_id': self.id,
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'invoice_line_ids': line_vals,
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}
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debit_note = self.env['account.move'].create(debit_note_vals)
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_logger.info(
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"Fusion Debit Note: created %s (id=%s) from %s (id=%s)",
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debit_note.name, debit_note.id, self.name, self.id,
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)
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# Return action to view the debit note
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if self.move_type == 'out_invoice':
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action_ref = 'account.action_move_out_invoice_type'
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else:
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action_ref = 'account.action_move_in_invoice_type'
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return {
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'type': 'ir.actions.act_window',
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'res_model': 'account.move',
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'res_id': debit_note.id,
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'view_mode': 'form',
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'target': 'current',
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'name': _("Debit Note"),
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}
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# =====================================================================
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# View Related Debit Notes
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# =====================================================================
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def action_view_debit_notes(self):
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"""Open the list of debit notes created from this invoice."""
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self.ensure_one()
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debit_notes = self.fusion_debit_note_ids
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if len(debit_notes) == 1:
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return {
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'type': 'ir.actions.act_window',
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'res_model': 'account.move',
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'res_id': debit_notes.id,
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'view_mode': 'form',
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'target': 'current',
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'name': _("Debit Note"),
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}
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return {
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'type': 'ir.actions.act_window',
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'res_model': 'account.move',
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'domain': [('id', 'in', debit_notes.ids)],
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'view_mode': 'list,form',
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'target': 'current',
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'name': _("Debit Notes"),
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}
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