diff --git a/mis_builder/models/mis_kpi_data.py b/mis_builder/models/mis_kpi_data.py
index f61d4b028..1f9ba18cb 100644
--- a/mis_builder/models/mis_kpi_data.py
+++ b/mis_builder/models/mis_kpi_data.py
@@ -69,6 +69,10 @@ def _compute_name(self):
                 rec.date_to,
             )
 
+    @api.model
+    def _intersect_days(self, item_dt_from, item_dt_to, dt_from, dt_to):
+        return intersect_days(item_dt_from, item_dt_to, dt_from, dt_to)
+
     @api.model
     def _query_kpi_data(self, date_from, date_to, base_domain):
         """Query mis.kpi.data over a time period.
@@ -85,7 +89,9 @@ def _query_kpi_data(self, date_from, date_to, base_domain):
         for item in self.search(domain):
             item_dt_from = fields.Date.from_string(item.date_from)
             item_dt_to = fields.Date.from_string(item.date_to)
-            i_days, item_days = intersect_days(item_dt_from, item_dt_to, dt_from, dt_to)
+            i_days, item_days = self._intersect_days(
+                item_dt_from, item_dt_to, dt_from, dt_to
+            )
             if item.kpi_expression_id.kpi_id.accumulation_method == ACC_SUM:
                 # accumulate pro-rata overlap between item and reporting period
                 res[item.kpi_expression_id] += item.amount * i_days / item_days
diff --git a/mis_builder/models/prorata_read_group_mixin.py b/mis_builder/models/prorata_read_group_mixin.py
index 6d9c36deb..b3b3791ff 100644
--- a/mis_builder/models/prorata_read_group_mixin.py
+++ b/mis_builder/models/prorata_read_group_mixin.py
@@ -31,6 +31,10 @@ def _search_date(self, operator, value):
             _("Unsupported operator %s for searching on date") % (operator,)
         )
 
+    @api.model
+    def _intersect_days(self, item_dt_from, item_dt_to, dt_from, dt_to):
+        return intersect_days(item_dt_from, item_dt_to, dt_from, dt_to)
+
     @api.model
     def read_group(
         self, domain, flds, groupby, offset=0, limit=None, orderby=False, lazy=True
@@ -75,7 +79,7 @@ def read_group(
                 for sum_field in sum_fields:
                     item_dt_from = fields.Date.from_string(item["date_from"])
                     item_dt_to = fields.Date.from_string(item["date_to"])
-                    i_days, item_days = intersect_days(
+                    i_days, item_days = self._intersect_days(
                         item_dt_from, item_dt_to, dt_from, dt_to
                     )
                     res_item[sum_field] += item[sum_field] * i_days / item_days
diff --git a/mis_builder/readme/newsfragments/280.misc b/mis_builder/readme/newsfragments/280.misc
new file mode 100644
index 000000000..48a58e179
--- /dev/null
+++ b/mis_builder/readme/newsfragments/280.misc
@@ -0,0 +1,3 @@
+The ``_intersect_date`` model method has been restored on ``mis.kpi.data``,
+and added on ``prorata.read_group.mixin`` as a semi-supported way to override
+the pro-rata temporis budget reporting mechanism.