Merge pull request #4444 from nabinhait/get_incoming_rate_fix

[fix] Get incoming rate if args as json

erpnext/stock/utils.py

@@ -93,6 +93,9 @@ def get_incoming_rate(args):
 	"""Get Incoming Rate based on valuation method"""
 	from erpnext.stock.stock_ledger import get_previous_sle
 	
+	if isinstance(args, basestring):
+		args = json.loads(args)
+
 	in_rate = 0
 	if (args.get("serial_no") or "").strip():
 		in_rate = get_avg_purchase_rate(args.get("serial_no"))