[feature] Blanket Order

- Creaete Sales or Purchase order from the blanket order
- If there is any blanket order for the customer/supplier rates will be fetched from that order
- Manually selecting the Blanket order will change the rates accordingly
- Upon submission of the order, the ordered qty will be updated in the Blanket Order

erpnext/buying/doctype/purchase_order/purchase_order.py

@@ -219,6 +219,9 @@ class PurchaseOrder(BuyingController):
 		frappe.get_doc('Authorization Control').validate_approving_authority(self.doctype,
 			self.company, self.base_grand_total)
 
+		self.update_blanket_order()
+
+
 	def on_cancel(self):
 		super(PurchaseOrder, self).on_cancel()
 
@@ -241,6 +244,9 @@ class PurchaseOrder(BuyingController):
 		self.update_requested_qty()
 		self.update_ordered_qty()
 
+		self.update_blanket_order(cancel=True)
+
+
 	def on_update(self):
 		pass
 

erpnext/buying/doctype/purchase_order_item/purchase_order_item.json

@@ -1594,6 +1594,37 @@
    "translatable": 0, 
    "unique": 0
   }, 
+  {
+   "allow_bulk_edit": 0, 
+   "allow_on_submit": 0, 
+   "bold": 0, 
+   "collapsible": 0, 
+   "columns": 0, 
+   "fieldname": "delivered_by_supplier", 
+   "fieldtype": "Check", 
+   "hidden": 0, 
+   "ignore_user_permissions": 0, 
+   "ignore_xss_filter": 0, 
+   "in_filter": 0, 
+   "in_global_search": 0, 
+   "in_list_view": 0, 
+   "in_standard_filter": 0, 
+   "label": "To be delivered to customer", 
+   "length": 0, 
+   "no_copy": 0, 
+   "permlevel": 0, 
+   "precision": "", 
+   "print_hide": 1, 
+   "print_hide_if_no_value": 0, 
+   "read_only": 1, 
+   "remember_last_selected_value": 0, 
+   "report_hide": 0, 
+   "reqd": 0, 
+   "search_index": 0, 
+   "set_only_once": 0, 
+   "translatable": 0, 
+   "unique": 0
+  }, 
   {
    "allow_bulk_edit": 0, 
    "allow_on_submit": 0, 
@@ -1611,7 +1642,7 @@
    "in_standard_filter": 0, 
    "label": "Blanket Order", 
    "length": 0, 
-   "no_copy": 0, 
+   "no_copy": 1, 
    "options": "Blanket Order", 
    "permlevel": 0, 
    "precision": "", 
@@ -1632,8 +1663,8 @@
    "bold": 0, 
    "collapsible": 0, 
    "columns": 0, 
-   "fieldname": "delivered_by_supplier", 
-   "fieldtype": "Check", 
+   "fieldname": "blanket_order_rate", 
+   "fieldtype": "Currency", 
    "hidden": 0, 
    "ignore_user_permissions": 0, 
    "ignore_xss_filter": 0, 
@@ -1641,9 +1672,9 @@
    "in_global_search": 0, 
    "in_list_view": 0, 
    "in_standard_filter": 0, 
-   "label": "To be delivered to customer", 
+   "label": "Blanket Order Rate", 
    "length": 0, 
-   "no_copy": 0, 
+   "no_copy": 1, 
    "permlevel": 0, 
    "precision": "", 
    "print_hide": 1, 
@@ -2083,7 +2114,7 @@
  "issingle": 0, 
  "istable": 1, 
  "max_attachments": 0, 
- "modified": "2018-05-24 09:15:37.473332", 
+ "modified": "2018-05-28 08:43:23.251530", 
  "modified_by": "Administrator", 
  "module": "Buying", 
  "name": "Purchase Order Item",