diff --git a/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py b/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
index af51fc5..522ed4f 100644
--- a/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
+++ b/erpnext/accounts/doctype/accounting_dimension/accounting_dimension.py
@@ -24,6 +24,11 @@
 			msg = _("Not allowed to create accounting dimension for {0}").format(self.document_type)
 			frappe.throw(msg)
 
+		exists = frappe.db.get_value("Accounting Dimension", {'document_type': self.document_type}, ['name'])
+
+		if exists and self.is_new():
+			frappe.throw("Document Type already used as a dimension")
+
 	def after_insert(self):
 		if frappe.flags.in_test:
 			make_dimension_in_accounting_doctypes(doc=self)
@@ -60,7 +65,8 @@
 			"label": doc.label,
 			"fieldtype": "Link",
 			"options": doc.document_type,
-			"insert_after": insert_after_field
+			"insert_after": insert_after_field,
+			"owner": "Administrator"
 		}
 
 		if doctype == "Budget":
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index cc00b7e..f594f96 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -642,3 +642,4 @@
 erpnext.patches.v12_0.set_default_shopify_app_type
 erpnext.patches.v12_0.replace_accounting_with_accounts_in_home_settings
 erpnext.patches.v12_0.set_payment_entry_status
+erpnext.patches.v12_0.update_owner_fields_in_acc_dimension_custom_fields
diff --git a/erpnext/patches/v12_0/update_owner_fields_in_acc_dimension_custom_fields.py b/erpnext/patches/v12_0/update_owner_fields_in_acc_dimension_custom_fields.py
new file mode 100644
index 0000000..e4dcecd
--- /dev/null
+++ b/erpnext/patches/v12_0/update_owner_fields_in_acc_dimension_custom_fields.py
@@ -0,0 +1,17 @@
+from __future__ import unicode_literals
+import frappe
+from erpnext.accounts.doctype.accounting_dimension.accounting_dimension import get_doctypes_with_dimensions
+
+def execute():
+	accounting_dimensions = frappe.db.sql("""select fieldname from
+		`tabAccounting Dimension`""", as_dict=1)
+
+	doclist = get_doctypes_with_dimensions()
+
+	for dimension in accounting_dimensions:
+		frappe.db.sql("""
+			UPDATE `tabCustom Field`
+			SET owner = 'Administrator'
+			WHERE fieldname = %s
+			AND dt IN (%s)""" %			#nosec
+			('%s', ', '.join(['%s']* len(doclist))), tuple([dimension.fieldname] + doclist))
\ No newline at end of file