diff --git a/mis_builder/models/mis_report_instance.py b/mis_builder/models/mis_report_instance.py
index 9acf6fe63..178196e2f 100644
--- a/mis_builder/models/mis_report_instance.py
+++ b/mis_builder/models/mis_report_instance.py
@@ -423,8 +423,7 @@ def _check_mode_source(self):
                 if rec.mode == MODE_NONE:
                     raise DateFilterRequired(
                         self.env._(
-                            "A date filter is mandatory for this source "
-                            "in column %s.",
+                            "A date filter is mandatory for this source in column %s.",
                             rec.name,
                         )
                     )
@@ -432,8 +431,7 @@ def _check_mode_source(self):
                 if rec.mode != MODE_NONE:
                     raise DateFilterForbidden(
                         self.env._(
-                            "No date filter is allowed for this source "
-                            "in column %s.",
+                            "No date filter is allowed for this source in column %s.",
                             rec.name,
                         )
                     )
@@ -460,8 +458,7 @@ def _check_source_cmpcol(self):
                 ):
                     raise ValidationError(
                         self.env._(
-                            "Columns to compare must belong to the same report "
-                            "in %s",
+                            "Columns to compare must belong to the same report in %s",
                             rec.name,
                         )
                     )
@@ -499,7 +496,7 @@ def _compute_pivot_date(self):
     sequence = fields.Integer(default=10)
     description = fields.Char(related="report_id.description")
     date = fields.Date(
-        string="Base date", help="Report base date " "(leave empty to use current date)"
+        string="Base date", help="Report base date (leave empty to use current date)"
     )
     pivot_date = fields.Date(compute="_compute_pivot_date")
     report_id = fields.Many2one("mis.report", required=True, string="Report")
@@ -765,9 +762,7 @@ def get_views(self, views, options=None):
             context.get("from_dashboard")
             and context.get("active_model") == "mis.report.instance"
         ):
-            view_id = self.env.ref(
-                "mis_builder." "mis_report_instance_result_view_form"
-            )
+            view_id = self.env.ref("mis_builder.mis_report_instance_result_view_form")
             mis_report_form_view = view_id and [view_id.id, "form"]
             for view in views:
                 if view and view[1] == "form":
@@ -778,7 +773,7 @@ def get_views(self, views, options=None):
 
     def preview(self):
         self.ensure_one()
-        view_id = self.env.ref("mis_builder." "mis_report_instance_result_view_form")
+        view_id = self.env.ref("mis_builder.mis_report_instance_result_view_form")
         return {
             "type": "ir.actions.act_window",
             "res_model": "mis.report.instance",
@@ -883,7 +878,11 @@ def _compute_matrix(self):
         self.ensure_one()
         aep = self.report_id._prepare_aep(self.query_company_ids, self.currency_id)
         multi_company = self.multi_company and len(self.query_company_ids) > 1
-        kpi_matrix = self.report_id.prepare_kpi_matrix(multi_company)
+        # Use the report instance's company context so that company-dependent
+        # fields (e.g. account code in Odoo 18) are read correctly when
+        # the user's current company differs from the report's company.
+        report = self.report_id.with_company(self.query_company_ids[0])
+        kpi_matrix = report.prepare_kpi_matrix(multi_company)
         for period in self.period_ids:
             description = None
             if period.mode == MODE_NONE:
diff --git a/mis_builder/tests/test_mis_report_instance.py b/mis_builder/tests/test_mis_report_instance.py
index ba8d83aed..8a074d4d2 100644
--- a/mis_builder/tests/test_mis_report_instance.py
+++ b/mis_builder/tests/test_mis_report_instance.py
@@ -490,6 +490,75 @@ def test_drilldown_views(self):
             [[False, "list"], [False, "form"], [False, "pivot"], [False, "graph"]],
         )
 
+    def test_account_code_multicompany_context(self):
+        """Account codes should display correctly when the report instance
+        belongs to a different company than the user's current company."""
+        # Create a second company
+        company2 = self.env["res.company"].create({"name": "Test Co 2"})
+        # Create an account in company2 with a code
+        account = (
+            self.env["account.account"]
+            .with_company(company2)
+            .create(
+                {
+                    "name": "Test Account",
+                    "code": "999001",
+                    "account_type": "expense",
+                    "company_ids": [(6, 0, [company2.id])],
+                }
+            )
+        )
+        # Verify the code is set for company2
+        acct_c2 = account.with_company(company2)
+        self.assertEqual(acct_c2.code, "999001")
+        # Verify the code is NOT visible from main company
+        acct_c1 = account.with_company(self.env.ref("base.main_company"))
+        self.assertFalse(acct_c1.code)
+        # Create a simple report + instance for company2
+        report = self.env["mis.report"].create({"name": "test mc report"})
+        self.env["mis.report.kpi"].create(
+            {
+                "report_id": report.id,
+                "name": "exp",
+                "description": "Expenses",
+                "auto_expand_accounts": True,
+                "sequence": 1,
+                "expression_ids": [
+                    (0, 0, {"name": "balp[999%]"}),
+                ],
+            }
+        )
+        instance = self.env["mis.report.instance"].create(
+            {
+                "name": "test mc instance",
+                "report_id": report.id,
+                "company_id": company2.id,
+                "period_ids": [
+                    (
+                        0,
+                        0,
+                        {
+                            "name": "p1",
+                            "mode": "fix",
+                            "manual_date_from": "2024-01-01",
+                            "manual_date_to": "2024-12-31",
+                        },
+                    ),
+                ],
+            }
+        )
+        # Compute the matrix — the user's current company is main_company,
+        # but the report belongs to company2. Account codes should still
+        # display correctly.
+        matrix = instance.compute()
+        body = matrix.get("body", [])
+        # Find any row with "999001" or "False" in the label
+        has_false = any("False" in (r.get("label") or "") for r in body)
+        self.assertFalse(
+            has_false,
+            "Account codes should not show as 'False' in multi-company reports",
+        )
+
     def test_qweb(self):
         self.report_instance.print_pdf()  # get action
         test_reports.try_report(