[Feature] Supplier warehouse link field on purchase order (#13051)

* Multiple Features:
[New] Supplier warehouse link field on purchase order for sub-contracting
[New] Auto select supplier warehouse while making purchase receipt from purchase order

* Set default to_warehouse in stock entry as the supplier warehouse
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.json b/erpnext/buying/doctype/purchase_order/purchase_order.json
index 21629f9..09efa27 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.json
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.json
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  "max_attachments": 0, 
- "modified": "2018-02-17 11:00:05.037716", 
+ "modified": "2018-02-21 14:26:17.099336", 
  "modified_by": "Administrator", 
  "module": "Buying", 
  "name": "Purchase Order", 
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index ce0b89b..8f4cb53 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -332,7 +332,8 @@
 		"Purchase Order": {
 			"doctype": "Purchase Receipt",
 			"field_map": {
-				"per_billed": "per_billed"
+				"per_billed": "per_billed",
+				"supplier_warehouse":"supplier_warehouse"
 			},
 			"validation": {
 				"docstatus": ["=", 1],
@@ -377,7 +378,8 @@
 		"Purchase Order": {
 			"doctype": "Purchase Invoice",
 			"field_map": {
-				"party_account_currency": "party_account_currency"
+				"party_account_currency": "party_account_currency",
+				"supplier_warehouse":"supplier_warehouse"
 			},
 			"validation": {
 				"docstatus": ["=", 1],
@@ -428,6 +430,7 @@
 		stock_entry.supplier_address = purchase_order.supplier_address
 		stock_entry.address_display = purchase_order.address_display
 		stock_entry.company = purchase_order.company
+		stock_entry.to_warehouse = purchase_order.supplier_warehouse
 		stock_entry.from_bom = 1
 		for item_code in item_code_list:
 			po_item = [d for d in purchase_order.items if d.item_code == item_code][0]
@@ -451,4 +454,4 @@
 def update_status(status, name):
 	po = frappe.get_doc("Purchase Order", name)
 	po.update_status(status)
-	po.update_delivered_qty_in_sales_order()
+	po.update_delivered_qty_in_sales_order()
\ No newline at end of file
diff --git a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
index fb12f19..46eee31 100644
--- a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
+++ b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.py
@@ -379,6 +379,9 @@
 	doclist = get_mapped_doc("Purchase Receipt", source_name,	{
 		"Purchase Receipt": {
 			"doctype": "Purchase Invoice",
+			"field_map": {
+				"supplier_warehouse":"supplier_warehouse"
+			},
 			"validation": {
 				"docstatus": ["=", 1],
 			},
@@ -423,4 +426,4 @@
 @frappe.whitelist()
 def update_purchase_receipt_status(docname, status):
 	pr = frappe.get_doc("Purchase Receipt", docname)
-	pr.update_status(status)
+	pr.update_status(status)
\ No newline at end of file