diff --git a/project_forecast_line_bokeh_chart/__init__.py b/project_forecast_line_bokeh_chart/__init__.py
index 4c4f242fa0..bf588bc8b8 100644
--- a/project_forecast_line_bokeh_chart/__init__.py
+++ b/project_forecast_line_bokeh_chart/__init__.py
@@ -1 +1,2 @@
+from . import models
 from . import report
diff --git a/project_forecast_line_bokeh_chart/models/__init__.py b/project_forecast_line_bokeh_chart/models/__init__.py
new file mode 100644
index 0000000000..d4f5b72ba7
--- /dev/null
+++ b/project_forecast_line_bokeh_chart/models/__init__.py
@@ -0,0 +1 @@
+from . import forecast_line
diff --git a/project_forecast_line_bokeh_chart/models/forecast_line.py b/project_forecast_line_bokeh_chart/models/forecast_line.py
new file mode 100644
index 0000000000..7a8bd484d3
--- /dev/null
+++ b/project_forecast_line_bokeh_chart/models/forecast_line.py
@@ -0,0 +1,43 @@
+# Copyright 2022 Therp BV <https://therp.nl>.
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+from odoo import api, models
+
+
+class ForecastLine(models.Model):
+
+    _inherit = "forecast.line"
+
+    @api.model
+    def _read_group_raw(
+        self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True
+    ):
+        """
+        Inherit and add __range key, like in odoo 15
+        https://github.com/odoo/odoo/blob/15.0/odoo/models.py#L2431
+        """
+        result = super()._read_group_raw(
+            domain,
+            fields,
+            groupby,
+            offset=offset,
+            limit=limit,
+            orderby=orderby,
+            lazy=lazy,
+        )
+        dt = [
+            f
+            for f in groupby
+            if self._fields[f.split(":")[0]].type
+            in ("date", "datetime")  # e.g. 'date:month'
+        ]
+        for group in result:
+            if dt:
+                group["__range"] = {}
+            for df in dt:
+                field_name = df.split(":")[0]
+                if group.get(df):
+                    range_from, range_to = group[df][0].split("/")
+                    group["__range"][field_name] = {"from": range_from, "to": range_to}
+                else:
+                    group["__range"][field_name] = False
+        return result
diff --git a/project_forecast_line_bokeh_chart/readme/CONTRIBUTORS.rst b/project_forecast_line_bokeh_chart/readme/CONTRIBUTORS.rst
index 8785f72c06..b3c64a952a 100644
--- a/project_forecast_line_bokeh_chart/readme/CONTRIBUTORS.rst
+++ b/project_forecast_line_bokeh_chart/readme/CONTRIBUTORS.rst
@@ -1 +1,2 @@
 * Alexandre Fayolle <alexandre.fayolle@camptocamp.com>
+* Nikos Tsirintanis <ntsirintanis@therp.nl>