[fix] editable amount in Purchase Taxes and Charges
diff --git a/erpnext/accounts/doctype/purchase_taxes_and_charges/purchase_taxes_and_charges.json b/erpnext/accounts/doctype/purchase_taxes_and_charges/purchase_taxes_and_charges.json
index ea1e59a..134330a 100644
--- a/erpnext/accounts/doctype/purchase_taxes_and_charges/purchase_taxes_and_charges.json
+++ b/erpnext/accounts/doctype/purchase_taxes_and_charges/purchase_taxes_and_charges.json
@@ -135,7 +135,7 @@
    "oldfieldtype": "Currency", 
    "options": "currency", 
    "permlevel": 0, 
-   "read_only": 1, 
+   "read_only": 0, 
    "reqd": 0
   }, 
   {
@@ -222,7 +222,7 @@
  "hide_heading": 1, 
  "idx": 1, 
  "istable": 1, 
- "modified": "2015-03-04 16:05:08.553606", 
+ "modified": "2015-04-03 13:49:24.719442", 
  "modified_by": "Administrator", 
  "module": "Accounts", 
  "name": "Purchase Taxes and Charges",