[fix] [minor] null issue
diff --git a/selling/utils.py b/selling/utils.py
index d24a350..43a5ad8 100644
--- a/selling/utils.py
+++ b/selling/utils.py
@@ -153,7 +153,7 @@
 	from utilities.transaction_base import validate_currency
 	validate_currency(args, item_bean.doc, meta)
 	
-	return {"ref_rate": flt(base_ref_rate[0].ref_rate * args.plc_conversion_rate / args.conversion_rate)}
+	return {"ref_rate": flt(base_ref_rate[0].ref_rate) * flt(args.plc_conversion_rate) / flt(args.conversion_rate)}
 	
 def _get_item_discount(item_group, customer):
 	parent_item_groups = [x[0] for x in webnotes.conn.sql("""SELECT parent.name 
diff --git a/stock/doctype/item_price/item_price.txt b/stock/doctype/item_price/item_price.txt
index 8062b57..7e23fb6 100644
--- a/stock/doctype/item_price/item_price.txt
+++ b/stock/doctype/item_price/item_price.txt
@@ -2,7 +2,7 @@
  {
   "creation": "2013-05-02 16:29:48", 
   "docstatus": 0, 
-  "modified": "2013-07-10 14:54:09", 
+  "modified": "2013-07-31 17:30:34", 
   "modified_by": "Administrator", 
   "owner": "Administrator"
  }, 
@@ -49,7 +49,7 @@
   "oldfieldname": "ref_rate", 
   "oldfieldtype": "Currency", 
   "options": "ref_currency", 
-  "reqd": 0, 
+  "reqd": 1, 
   "search_index": 0
  }, 
  {