new account_edi_ubl_fiscal_position

account_edi_ubl_fiscal_position/__init__.py

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+from . import models

account_edi_ubl_fiscal_position/__manifest__.py

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+{
+    'name': 'UBL Import - Apply Fiscal Position Tax Mapping',
+    'version': '16.0.1.0.0',
+    'summary': 'Applies supplier fiscal position tax mapping during UBL/EDI invoice import',
+    'description': """
+        Odoo 16 does not apply fiscal positions to vendor bills during UBL
+        import (_import_fill_invoice_line_taxes only searches by percentage,
+        ignoring fiscal position entirely).
+
+        This module overrides that method to apply the partner's fiscal
+        position tax mapping immediately after tax detection, so the correct
+        tax code is set without any manual correction.
+
+        Usage:
+        - Set a Fiscal Position on the supplier (Verkopen & Inkopen tab)
+        - Add the correct tax mapping in that Fiscal Position
+        - Import UBL invoices as usual - taxes will be corrected automatically
+    """,
+    'author': 'Busenco / Villajoyosa Digital',
+    'category': 'Accounting',
+    'depends': ['account_edi_ubl_cii'],
+    'data': [],
+    'installable': True,
+    'auto_install': False,
+    'license': 'LGPL-3',
+}

account_edi_ubl_fiscal_position/models/__init__.py

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+from . import account_edi_common

account_edi_ubl_fiscal_position/models/account_edi_common.py

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+from odoo import models
+
+
+class AccountEdiCommon(models.AbstractModel):
+    _inherit = 'account.edi.common'
+
+    def _import_fill_invoice_line_taxes(
+        self, journal, tax_nodes, invoice_line_form, inv_line_vals, logs
+    ):
+        """
+        Override to apply the supplier's fiscal position tax mapping after
+        the standard UBL tax detection.
+
+        Odoo 16 does not apply fiscal positions to vendor bills during UBL
+        import. The standard method only searches by percentage (amount=6,
+        limit=1), ignoring fiscal position entirely. This override applies
+        the partner's fiscal position mapping immediately after detection.
+        """
+        # Run standard tax detection first
+        logs = super()._import_fill_invoice_line_taxes(
+            journal, tax_nodes, invoice_line_form, inv_line_vals, logs
+        )
+
+        # Apply fiscal position mapping if the invoice has one
+        move = invoice_line_form.move_id
+        fiscal_position = move.fiscal_position_id
+
+        if not fiscal_position or not inv_line_vals.get('taxes'):
+            return logs
+
+        detected_taxes = self.env['account.tax'].browse(inv_line_vals['taxes'])
+        mapped_taxes = fiscal_position.map_tax(detected_taxes)
+
+        if mapped_taxes != detected_taxes:
+            inv_line_vals['taxes'] = mapped_taxes.ids
+            invoice_line_form.tax_ids = mapped_taxes
+
+        return logs