Update sales_order.py

1. filter out the suppliers by which the dropship purchase order already created
2. allow create multi dropship draft purchase orders

erpnext/selling/doctype/sales_order/sales_order.py

@@ -732,12 +732,12 @@ def get_events(start, end, filters=None):
 @frappe.whitelist()
 def make_purchase_order_for_drop_shipment(source_name, for_supplier, target_doc=None):
 	def set_missing_values(source, target):
-		target.supplier = for_supplier
+		target.supplier = supplier
 		target.apply_discount_on = ""
 		target.additional_discount_percentage = 0.0
 		target.discount_amount = 0.0
 
-		default_price_list = frappe.get_value("Supplier", for_supplier, "default_price_list")
+		default_price_list = frappe.get_value("Supplier", supplier, "default_price_list")
 		if default_price_list:
 			target.buying_price_list = default_price_list
 
@@ -767,7 +767,18 @@ def make_purchase_order_for_drop_shipment(source_name, for_supplier, target_doc=
 		target.stock_qty = (flt(source.qty) - flt(source.ordered_qty)) * flt(source.conversion_factor)
 		target.project = source_parent.project
 
-	doclist = get_mapped_doc("Sales Order", source_name, {
+	suppliers =[]
+	if for_supplier:
+		suppliers.append(for_supplier)
+	else:
+		sales_order = frappe.get_doc("Sales Order", source_name)
+		for item in sales_order.items:
+			if item.supplier and item.supplier not in suppliers:
+				suppliers.append(item.supplier)
+	for supplier in suppliers:
+		po =frappe.get_list("Purchase Order", filters={"sales_order":source_name, "supplier":supplier, "docstatus": ("<", "2")})
+		if len(po) == 0:
+			doc = get_mapped_doc("Sales Order", source_name, {
 				"Sales Order": {
 					"doctype": "Purchase Order",
 					"field_no_map": [
@@ -797,11 +808,20 @@ def make_purchase_order_for_drop_shipment(source_name, for_supplier, target_doc=
 						"price_list_rate"
 					],
 					"postprocess": update_item,
-			"condition": lambda doc: doc.ordered_qty < doc.qty and doc.supplier == for_supplier
+					"condition": lambda doc: doc.ordered_qty < doc.qty and doc.supplier == supplier
 				}
 			}, target_doc, set_missing_values)
+			if not for_supplier:
+				doc.insert()
+		else:
+			suppliers =[]
+	if suppliers:
+		if not for_supplier:
+			frappe.db.commit()
+		return doc
+	else:
+		frappe.msgprint(_("PO already created for all sales order items"))
 
-	return doclist
 
 @frappe.whitelist()
 def get_supplier(doctype, txt, searchfield, start, page_len, filters):
@@ -817,6 +837,8 @@ def get_supplier(doctype, txt, searchfield, start, page_len, filters):
 			and ({key} like %(txt)s
 				or supplier_name like %(txt)s)
 			and name in (select supplier from `tabSales Order Item` where parent = %(parent)s)
+			and name not in (select supplier from `tabPurchase Order` po inner join `tabPurchase Order Item` poi
+			     on po.name=poi.parent where po.docstatus<2 and poi.sales_order=%(parent)s)			
 		order by
 			if(locate(%(_txt)s, name), locate(%(_txt)s, name), 99999),
 			if(locate(%(_txt)s, supplier_name), locate(%(_txt)s, supplier_name), 99999),