Subscriptions doctype - trial start and end are set_only_once
diff --git a/erpnext/accounts/doctype/subscriptions/subscriptions.json b/erpnext/accounts/doctype/subscriptions/subscriptions.json
index 61f83e1..8537178 100644
--- a/erpnext/accounts/doctype/subscriptions/subscriptions.json
+++ b/erpnext/accounts/doctype/subscriptions/subscriptions.json
@@ -260,7 +260,7 @@
    "report_hide": 0, 
    "reqd": 0, 
    "search_index": 0, 
-   "set_only_once": 0, 
+   "set_only_once": 1, 
    "translatable": 0, 
    "unique": 0
   }, 
@@ -292,7 +292,7 @@
    "report_hide": 0, 
    "reqd": 0, 
    "search_index": 0, 
-   "set_only_once": 0, 
+   "set_only_once": 1, 
    "translatable": 0, 
    "unique": 0
   }, 
@@ -319,7 +319,7 @@
    "precision": "", 
    "print_hide": 0, 
    "print_hide_if_no_value": 0, 
-   "read_only": 1, 
+   "read_only": 0, 
    "remember_last_selected_value": 0, 
    "report_hide": 0, 
    "reqd": 0, 
@@ -687,7 +687,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2018-02-26 05:14:02.269620", 
+ "modified": "2018-02-26 13:34:04.108822", 
  "modified_by": "Administrator", 
  "module": "Accounts", 
  "name": "Subscriptions",