diff --git a/mis_builder/models/mis_report.py b/mis_builder/models/mis_report.py
index c4442f239..6711c9148 100644
--- a/mis_builder/models/mis_report.py
+++ b/mis_builder/models/mis_report.py
@@ -619,7 +619,7 @@ def _fetch_queries(self, date_from, date_to, get_additional_query_filter=None):
                         v = data[0][field_name]
                     except KeyError:
                         _logger.error(
-                            "field %s not found in read_group " "for %s; not summable?",
+                            "field %s not found in read_group for %s; not summable?",
                             field_name,
                             model._name,
                         )
@@ -642,6 +642,26 @@ def _fetch_queries(self, date_from, date_to, get_additional_query_filter=None):
                 res[query.name] = s
         return res
 
+    def _get_computed_drilldown_arg(self, expr, col_key, kpi):
+        """Return a drilldown_arg for a computed KPI if it references
+        other KPIs that have account variables.
+
+        This enables drilldown on summary rows like ``expenses + equip``
+        by combining the journal entry domains of the referenced KPIs.
+        """
+        referenced_kpis = self.kpi_ids.filtered(
+            lambda k: k.name in expr and k.id != kpi.id
+        )
+        has_account_child = any(
+            AEP.has_account_var(e.name)
+            for k in referenced_kpis
+            for e in k.expression_ids
+            if e.name
+        )
+        if has_account_child:
+            return {"expr": expr, "period_id": col_key, "kpi_id": kpi.id}
+        return None
+
     def _declare_and_compute_col(  # noqa: C901 (TODO simplify this fnction)
         self,
         expression_evaluator,
@@ -688,11 +708,19 @@ def _declare_and_compute_col(  # noqa: C901 (TODO simplify this fnction)
                     drilldown_args,
                     name_error,
                 ) = expression_evaluator.eval_expressions(expressions, locals_dict)
-                for drilldown_arg in drilldown_args:
-                    if not drilldown_arg:
+                for i, drilldown_arg in enumerate(drilldown_args):
+                    if drilldown_arg:
+                        drilldown_arg["period_id"] = col_key
+                        drilldown_arg["kpi_id"] = kpi.id
                         continue
-                    drilldown_arg["period_id"] = col_key
-                    drilldown_arg["kpi_id"] = kpi.id
+                    # For computed KPIs without account vars, check if the
+                    # expression references other KPIs that have account vars
+                    # so we can enable drilldown on the computed total.
+                    expr = expressions[i] and expressions[i].name
+                    if expr and not name_error:
+                        drilldown_args[i] = self._get_computed_drilldown_arg(
+                            expr, col_key, kpi
+                        )
 
                 if name_error:
                     recompute_queue.append(kpi)
diff --git a/mis_builder/models/mis_report_instance.py b/mis_builder/models/mis_report_instance.py
index 9acf6fe63..1e3f06534 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",
@@ -967,8 +962,10 @@ def drilldown(self, arg):
         period_id = arg.get("period_id")
         expr = arg.get("expr")
         account_id = arg.get("account_id")
-        if period_id and expr and AEP.has_account_var(expr):
-            period = self.env["mis.report.instance.period"].browse(period_id)
+        if not (period_id and expr):
+            return False
+        period = self.env["mis.report.instance.period"].browse(period_id)
+        if AEP.has_account_var(expr):
             aep = AEP(
                 self.query_company_ids, self.currency_id, self.report_id.account_model
             )
@@ -992,8 +989,70 @@ def drilldown(self, arg):
                 "target": "current",
                 "context": {"active_test": False},
             }
+        # For computed KPIs, resolve referenced KPI expressions and combine
+        domain = self._get_computed_kpi_drilldown_domain(expr, period, account_id)
+        if domain is not None:
+            views = self._get_drilldown_model_views(period.source_aml_model_name)
+            return {
+                "name": self._get_drilldown_action_name(arg),
+                "domain": domain,
+                "type": "ir.actions.act_window",
+                "res_model": period.source_aml_model_name,
+                "views": [[False, view] for view in views],
+                "view_mode": ",".join(view for view in views),
+                "target": "current",
+                "context": {"active_test": False},
+            }
+        return False
+
+    def _get_computed_kpi_drilldown_domain(self, expr, period, account_id):
+        """Build a combined AML domain for computed KPIs.
+
+        When a KPI expression references other KPIs (e.g. ``expenses +
+        equip``), resolve each referenced KPI to its account expression and
+        combine the resulting domains with OR so the user sees all journal
+        entries that contribute to the computed value.
+        """
+        report = self.report_id
+        kpi_by_name = {kpi.name: kpi for kpi in report.kpi_ids}
+        # Collect account-var expressions from referenced KPIs
+        account_exprs = []
+        for kpi_name, kpi in kpi_by_name.items():
+            if kpi_name not in expr:
+                continue
+            for kpi_expr in kpi.expression_ids:
+                if kpi_expr.name and AEP.has_account_var(kpi_expr.name):
+                    account_exprs.append(kpi_expr.name)
+        if not account_exprs:
+            return None
+        # Build individual domains and combine with OR
+        domains = []
+        for acct_expr in account_exprs:
+            aep = AEP(
+                self.query_company_ids,
+                self.currency_id,
+                report.account_model,
+            )
+            aep.parse_expr(acct_expr)
+            aep.done_parsing()
+            domain = aep.get_aml_domain_for_expr(
+                acct_expr,
+                period.date_from,
+                period.date_to,
+                account_id,
+            )
+            domains.append(domain)
+        if len(domains) == 1:
+            combined = domains[0]
         else:
-            return False
+            # Combine with OR: ['|', domain1, '|', domain2, domain3]
+            combined = []
+            for i, domain in enumerate(domains):
+                if i < len(domains) - 1:
+                    combined.append("|")
+                combined.extend(domain)
+        combined.extend(period._get_additional_move_line_filter())
+        return combined
 
     def _get_drilldown_action_name(self, arg):
         kpi_id = arg.get("kpi_id")
diff --git a/mis_builder/static/src/components/mis_report_widget.esm.js b/mis_builder/static/src/components/mis_report_widget.esm.js
index c00d6177a..5ad6cd477 100644
--- a/mis_builder/static/src/components/mis_report_widget.esm.js
+++ b/mis_builder/static/src/components/mis_report_widget.esm.js
@@ -130,14 +130,17 @@ export class MisReportWidget extends Component {
     }
 
     async drilldown(event) {
-        const drilldown = JSON.parse(event.target.dataset.drilldown);
+        const el = event.currentTarget || event.target;
+        const drilldown = JSON.parse(el.dataset.drilldown);
         const action = await this.orm.call(
             "mis.report.instance",
             "drilldown",
             [this._instanceId(), drilldown],
             {context: this.context}
         );
-        this.action.doAction(action);
+        if (action) {
+            this.action.doAction(action);
+        }
     }
 
     async refresh() {
diff --git a/mis_builder/tests/test_mis_report_instance.py b/mis_builder/tests/test_mis_report_instance.py
index ba8d83aed..c3f7614d7 100644
--- a/mis_builder/tests/test_mis_report_instance.py
+++ b/mis_builder/tests/test_mis_report_instance.py
@@ -490,6 +490,74 @@ def test_drilldown_views(self):
             [[False, "list"], [False, "form"], [False, "pivot"], [False, "graph"]],
         )
 
+    def test_drilldown_computed_kpi(self):
+        """Computed KPIs that reference account-var KPIs should be drillable."""
+        # k4 = k1 + k2 + k3 ; k1 and k2 have balp[200%] expressions
+        k4 = self.env["mis.report.kpi"].search(
+            [("report_id", "=", self.report.id), ("name", "=", "k4")]
+        )
+        period = self.report_instance.period_ids[0]
+        action = self.report_instance.drilldown(
+            {"expr": "k1 + k2 + k3", "period_id": period.id, "kpi_id": k4.id}
+        )
+        self.assertTrue(
+            action,
+            "Computed KPI referencing account KPIs should drilldown",
+        )
+        self.assertEqual(action["type"], "ir.actions.act_window")
+        self.assertEqual(action["res_model"], "account.move.line")
+        # Domain should contain account_id filters from both k1 and k2
+        domain_str = str(action["domain"])
+        self.assertIn("account_id", domain_str)
+
+    def test_drilldown_computed_kpi_no_account_refs(self):
+        """Computed KPIs with no account-var references should return False."""
+        # Create a KPI that only references constants
+        kpi_const = self.env["mis.report.kpi"].create(
+            {
+                "report_id": self.report.id,
+                "description": "constant total",
+                "name": "k_const_total",
+                "multi": False,
+                "expression": "k3",
+            }
+        )
+        period = self.report_instance.period_ids[0]
+        action = self.report_instance.drilldown(
+            {"expr": "k3", "period_id": period.id, "kpi_id": kpi_const.id}
+        )
+        self.assertFalse(
+            action, "Computed KPI with no account refs should not drilldown"
+        )
+
+    def test_drilldown_falsy_args(self):
+        """Drilldown with missing period or expr should return False."""
+        self.assertFalse(self.report_instance.drilldown({}))
+        self.assertFalse(self.report_instance.drilldown({"expr": "balp[200%]"}))
+        self.assertFalse(
+            self.report_instance.drilldown(
+                {"period_id": self.report_instance.period_ids[0].id}
+            )
+        )
+
+    def test_computed_kpi_clickable_in_matrix(self):
+        """Computed KPIs referencing account KPIs should have
+        drilldown_arg."""
+        matrix = self.report_instance.compute()
+        # Find the k4 row (description "kpi 4", computed: k1+k2+k3)
+        k4_row = None
+        for row in matrix.get("body", []):
+            if row.get("label") == "kpi 4":
+                k4_row = row
+                break
+        self.assertTrue(k4_row, "k4 row should be in the report body")
+        # At least one cell should have drilldown_arg
+        has_dd = any("drilldown_arg" in c for c in k4_row.get("cells", []))
+        self.assertTrue(
+            has_dd,
+            "Computed KPI k4 should be clickable",
+        )
+
     def test_qweb(self):
         self.report_instance.print_pdf()  # get action
         test_reports.try_report(