diff --git a/hr_timesheet_overtime/README.rst b/hr_timesheet_overtime/README.rst
index c5b5d5f..b369862 100644
--- a/hr_timesheet_overtime/README.rst
+++ b/hr_timesheet_overtime/README.rst
@@ -29,6 +29,32 @@ Computes overtime hours according to employee's contracts.
 .. contents::
    :local:
 
+Known issues / Roadmap
+======================
+
+There is a problem with the way this module handles rates for overtime. If the
+rate ever changes, things will start to break.
+
+At time of writing (2024-06-28), the way a rate is computed for a date is by
+looking _exclusively_ at the corresponding day of the week. This should be more
+robust.
+
+Furthermore, when inserting hours worked, the actual hours worked get lost. You
+(try to) write a value to ``unit_amount``, but an augmented value gets written
+to the field instead. This is rather ugly.
+
+We can improve this by relying on the computation of ``unit_amount`` in Odoo
+≥16: create a new field ``hours_worked``, which contains the actual hours worked
+sans rate. Then, compute ``unit_amount`` from ``hours_worked`` (in a more robust
+fashion than is presently the case). In the interface, show ``hours_worked``
+more prominently than ``unit_amount`` as the main editable field.
+
+To make this module subsequently compatible with ``hr_timesheet_begin_end``,
+``hours_worked`` must be computed from ``time_stop`` and ``time_start``, and
+``unit_amount`` must use this module's computation method instead of
+``hr_timesheet_begin_end``'s. The compatibility layer should go into its own
+module.
+
 Bug Tracker
 ===========
 
diff --git a/hr_timesheet_overtime/models/account_analytic_line.py b/hr_timesheet_overtime/models/account_analytic_line.py
index b4308c9..b4667b9 100644
--- a/hr_timesheet_overtime/models/account_analytic_line.py
+++ b/hr_timesheet_overtime/models/account_analytic_line.py
@@ -15,10 +15,11 @@ class AnalyticLine(models.Model):
 
     _inherit = "account.analytic.line"
 
-    @api.model
-    def create(self, values):
-        self._update_values(values)
-        return super().create(values)
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            self._update_values(vals)
+        return super().create(vals_list)
 
     @api.multi
     def write(self, values):
@@ -32,17 +33,19 @@ def _update_values(self, values):
         Update values if date or unit_amount fields have changed
         """
         if "date" in values or "unit_amount" in values:
+            # TODO: self.date and self.unit_amount do not exist when called from
+            # create().
             date = values.get("date", self.date)
             unit_amount = values.get("unit_amount", self.unit_amount)
+            values["unit_amount"] = unit_amount * self.rate_for_date(date)
 
-            # rate management
-            weekday = fields.Date.from_string(date).weekday()
-            rate = (
-                self.env["resource.overtime.rate"]
-                .search([("dayofweek", "=", weekday)], limit=1)
-                .rate
-                or 1.0
-            )
-
-            # update
-            values["unit_amount"] = unit_amount * rate
+    @api.model
+    def rate_for_date(self, date):
+        # n.b. from_string also works on date objects, returning itself.
+        weekday = fields.Date.from_string(date).weekday()
+        return (
+            self.env["resource.overtime.rate"]
+            .search([("dayofweek", "=", weekday)], limit=1)
+            .rate
+            or 1.0
+        )
diff --git a/hr_timesheet_overtime/readme/ROADMAP.rst b/hr_timesheet_overtime/readme/ROADMAP.rst
new file mode 100644
index 0000000..08e5a7f
--- /dev/null
+++ b/hr_timesheet_overtime/readme/ROADMAP.rst
@@ -0,0 +1,22 @@
+There is a problem with the way this module handles rates for overtime. If the
+rate ever changes, things will start to break.
+
+At time of writing (2024-06-28), the way a rate is computed for a date is by
+looking _exclusively_ at the corresponding day of the week. This should be more
+robust.
+
+Furthermore, when inserting hours worked, the actual hours worked get lost. You
+(try to) write a value to ``unit_amount``, but an augmented value gets written
+to the field instead. This is rather ugly.
+
+We can improve this by relying on the computation of ``unit_amount`` in Odoo
+≥16: create a new field ``hours_worked``, which contains the actual hours worked
+sans rate. Then, compute ``unit_amount`` from ``hours_worked`` (in a more robust
+fashion than is presently the case). In the interface, show ``hours_worked``
+more prominently than ``unit_amount`` as the main editable field.
+
+To make this module subsequently compatible with ``hr_timesheet_begin_end``,
+``hours_worked`` must be computed from ``time_stop`` and ``time_start``, and
+``unit_amount`` must use this module's computation method instead of
+``hr_timesheet_begin_end``'s. The compatibility layer should go into its own
+module.