diff --git a/InvenTree/order/serializers.py b/InvenTree/order/serializers.py
index be75bf1533..56f10c3352 100644
--- a/InvenTree/order/serializers.py
+++ b/InvenTree/order/serializers.py
@@ -168,7 +168,7 @@ class POLineItemSerializer(InvenTreeModelSerializer):
     quantity = serializers.FloatField(default=1)
     received = serializers.FloatField(default=0)
 
-    overdue = serializers.BooleanField()
+    overdue = serializers.BooleanField(required=False, read_only=True)
 
     total_price = serializers.FloatField(read_only=True)
 
diff --git a/InvenTree/order/templates/order/purchase_order_detail.html b/InvenTree/order/templates/order/purchase_order_detail.html
index 74ce484e7a..b9972d73fc 100644
--- a/InvenTree/order/templates/order/purchase_order_detail.html
+++ b/InvenTree/order/templates/order/purchase_order_detail.html
@@ -174,6 +174,7 @@ $('#new-po-line').click(function() {
                 value: '{{ order.supplier.currency }}',
                 {% endif %}
             },
+            target_date: {},
             destination: {},
             notes: {},
         },