diff --git a/server/settings.py b/server/settings.py
index 9393d237..3042324e 100644
--- a/server/settings.py
+++ b/server/settings.py
@@ -442,3 +442,5 @@
 TIME_FORMAT_SHORT = "%I:%M %p"
 DATE_FORMAT_SHORT = "%Y-%m-%d"
 DATETIME_FORMAT = "%I:%M %p %Y-%m-%d"
+
+PLANNING_DUPLICATE_RETAIN_ASSIGNEE_DETAILS = True