fix: provision to setup customer name on quotation save and patch for the same

erpnext/patches.txt

@@ -595,3 +595,4 @@ erpnext.patches.v11_1.woocommerce_set_creation_user
 erpnext.patches.v11_1.delete_bom_browser
 erpnext.patches.v11_1.set_salary_details_submittable
 erpnext.patches.v11_1.rename_depends_on_lwp
+erpnext.patches.v11_1.set_missing_title_for_quotation

erpnext/patches/v11_1/set_missing_title_for_quotation.py

@@ -0,0 +1,27 @@
+import frappe
+
+def execute():
+	'''update customer_name from Customer document if quotation_to is set to Customer '''
+	frappe.db.sql('''
+		update tabQuotation, tabCustomer
+		set
+			tabQuotation.customer_name = tabCustomer.customer_name,
+			tabQuotation.title = tabCustomer.customer_name
+		where
+			tabQuotation.customer_name is null
+			and tabQuotation.party_name = tabCustomer.name
+			and tabQuotation.quotation_to = 'Customer'
+	''')
+
+	'''update customer_name from Lead document if quotation_to is set to Lead '''
+
+	frappe.db.sql('''
+		update tabQuotation, tabLead
+		set
+			tabQuotation.customer_name =  case when ifnull(tabLead.company_name, '') != '' then tabLead.company_name else tabLead.lead_name end,
+			tabQuotation.title = case when ifnull(tabLead.company_name, '') != '' then tabLead.company_name else tabLead.lead_name end
+		where
+			tabQuotation.customer_name is null
+			and tabQuotation.party_name = tabLead.name
+			and tabQuotation.quotation_to = 'Lead'
+	''')

erpnext/selling/doctype/quotation/quotation.json

@@ -195,7 +195,7 @@
    "bold": 1, 
    "collapsible": 0, 
    "columns": 0, 
-   "fetch_from": "customer.customer_name", 
+   "fetch_from": "", 
    "fetch_if_empty": 0, 
    "fieldname": "customer_name", 
    "fieldtype": "Data", 
@@ -3224,7 +3224,7 @@
  "istable": 0, 
  "max_attachments": 1, 
  "menu_index": 0, 
- "modified": "2019-05-02 14:10:43.355616", 
+ "modified": "2019-05-02 15:16:37.394455", 
  "modified_by": "Administrator", 
  "module": "Selling", 
  "name": "Quotation", 

erpnext/selling/doctype/quotation/quotation.py

@@ -29,6 +29,7 @@ class Quotation(SellingController):
 		self.validate_order_type()
 		self.validate_uom_is_integer("stock_uom", "qty")
 		self.validate_valid_till()
+		self.set_customer_name()
 		if self.items:
 			self.with_items = 1
 
@@ -46,6 +47,13 @@ class Quotation(SellingController):
 		if self.quotation_to == "Lead" and self.party_name:
 			frappe.get_doc("Lead", self.party_name).set_status(update=True)
 
+	def set_customer_name(self):
+		if self.party_name and self.quotation_to == 'Customer':
+			self.customer_name = frappe.db.get_value("Customer", self.party_name, "customer_name")
+		elif self.party_name and self.quotation_to == 'Lead':
+			lead_name, company_name = frappe.db.get_value("Lead", self.party_name, ["lead_name", "company_name"])
+			self.customer_name = company_name or lead_name
+
 	def update_opportunity(self):
 		for opportunity in list(set([d.prevdoc_docname for d in self.get("items")])):
 			if opportunity: