diff --git a/erpnext/__init__.py b/erpnext/__init__.py
index 4c66d93..edc4c9b 100644
--- a/erpnext/__init__.py
+++ b/erpnext/__init__.py
@@ -4,7 +4,6 @@
 
 __version__ = '8.3.1'
 
-
 def get_default_company(user=None):
 	'''Get default company for user'''
 	from frappe.defaults import get_user_default_as_list
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice_dashboard.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice_dashboard.py
index bc9d766..bfe00ef 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice_dashboard.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice_dashboard.py
@@ -11,7 +11,8 @@
 			'Sales Invoice': 'return_against'
 		},
 		'internal_links': {
-			'Sales Order': ['items', 'sales_order']
+			'Sales Order': ['items', 'sales_order'],
+			'Delivery Note': ['items', 'delivery_note']
 		},
 		'transactions': [
 			{
diff --git a/erpnext/accounts/report/accounts_receivable/accounts_receivable.html b/erpnext/accounts/report/accounts_receivable/accounts_receivable.html
index b798d2b..853b805 100644
--- a/erpnext/accounts/report/accounts_receivable/accounts_receivable.html
+++ b/erpnext/accounts/report/accounts_receivable/accounts_receivable.html
@@ -1,9 +1,3 @@
-{% var letterhead= filters.letter_head || (frappe.get_doc(":Company", filters.company) && frappe.get_doc(":Company", filters.company).default_letter_head) || frappe.defaults.get_default("letter_head"); %}
-{% if(letterhead) { %} 
-<div style="margin-bottom: 7px;" class="text-center">
-	{%= frappe.boot.letter_heads[letterhead].header %}
-</div>
-{% } %}
 <h2 class="text-center">{%= __(report.report_name) %}</h2>
 <h4 class="text-center">{%= filters.customer || filters.supplier %} </h4>
 <h5 class="text-center">
diff --git a/erpnext/accounts/report/general_ledger/general_ledger.html b/erpnext/accounts/report/general_ledger/general_ledger.html
index 0a25225..91cc3c9 100644
--- a/erpnext/accounts/report/general_ledger/general_ledger.html
+++ b/erpnext/accounts/report/general_ledger/general_ledger.html
@@ -1,9 +1,3 @@
-{% var letterhead= filters.letter_head || (frappe.get_doc(":Company", filters.company) && frappe.get_doc(":Company", filters.company).default_letter_head) || frappe.defaults.get_default("letter_head"); %}
-{% if(letterhead) { %} 
-<div style="margin-bottom: 7px;" class="text-center">
-	{%= frappe.boot.letter_heads[letterhead].header %}
-</div>
-{% } %}
 <h2 class="text-center">{%= __("Statement of Account") %}</h2>
 <h4 class="text-center">
 	{% if (filters.party_name) { %}
diff --git a/erpnext/docs/assets/img/setup/email/email-alert-set-property.png b/erpnext/docs/assets/img/setup/email/email-alert-set-property.png
new file mode 100644
index 0000000..658b149
--- /dev/null
+++ b/erpnext/docs/assets/img/setup/email/email-alert-set-property.png
Binary files differ
diff --git a/erpnext/docs/user/manual/en/setting-up/email/email-alerts.md b/erpnext/docs/user/manual/en/setting-up/email/email-alerts.md
index 9ec3073..8d239ea 100644
--- a/erpnext/docs/user/manual/en/setting-up/email/email-alerts.md
+++ b/erpnext/docs/user/manual/en/setting-up/email/email-alerts.md
@@ -42,6 +42,7 @@
 
 The above example will send an Email Alert when a Task is saved with the status "Open" and the Expected End Date for the Task is the date on or before the date on which it was saved on.
 
+
 ### Setting a Message
 
 You can use both Jinja Tags (`{% raw %}{{ doc.[field_name] }}{% endraw %}`) and HTML tags in the message textbox.
@@ -64,6 +65,17 @@
 
 ---
 
+### Setting a Value after the Alert is Set
+
+Sometimes to make sure that the email alert is not sent multiple times, you can
+define a custom property (via Customize Form) like "Email Alert Sent" and then
+set this property after the alert is sent by setting the **Set Property After Alert**
+field.
+
+Then you can use that as a condition in the **Condition** rules to ensure emails are not sent multiple times
+
+<img class="screenshot" alt="Setting Property in Email Alert" src="{{docs_base_url}}/assets/img/setup/email/email-alert-subject.png">
+
 ### Example
 
 1. Defining the Criteria