diff --git a/erpnext/stock/doctype/packing_slip/packing_slip.json b/erpnext/stock/doctype/packing_slip/packing_slip.json
index 4e944039132..a860c72faf3 100644
--- a/erpnext/stock/doctype/packing_slip/packing_slip.json
+++ b/erpnext/stock/doctype/packing_slip/packing_slip.json
@@ -248,7 +248,7 @@
    "description": "Identification of the package for the delivery (for print)", 
    "fetch_if_empty": 0, 
    "fieldname": "from_case_no", 
-   "fieldtype": "Data", 
+   "fieldtype": "Int", 
    "hidden": 0, 
    "ignore_user_permissions": 0, 
    "ignore_xss_filter": 0, 
@@ -313,7 +313,7 @@
    "description": "If more than one package of the same type (for print)", 
    "fetch_if_empty": 0, 
    "fieldname": "to_case_no", 
-   "fieldtype": "Data", 
+   "fieldtype": "Int", 
    "hidden": 0, 
    "ignore_user_permissions": 0, 
    "ignore_xss_filter": 0, 
@@ -773,7 +773,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2019-05-30 21:50:38.260908", 
+ "modified": "2019-09-09 12:40:22.497613", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Packing Slip", 
diff --git a/erpnext/stock/doctype/packing_slip/packing_slip.py b/erpnext/stock/doctype/packing_slip/packing_slip.py
index b99215c426a..7a5ae317c2b 100644
--- a/erpnext/stock/doctype/packing_slip/packing_slip.py
+++ b/erpnext/stock/doctype/packing_slip/packing_slip.py
@@ -49,11 +49,10 @@ class PackingSlip(Document):
 			frappe.msgprint(_("Please specify a valid 'From Case No.'"), raise_exception=1)
 		elif not self.to_case_no:
 			self.to_case_no = self.from_case_no
-		elif self.from_case_no > self.to_case_no:
+		elif cint(self.from_case_no) > cint(self.to_case_no):
 			frappe.msgprint(_("'To Case No.' cannot be less than 'From Case No.'"),
 				raise_exception=1)
 
-
 		res = frappe.db.sql("""SELECT name FROM `tabPacking Slip`
 			WHERE delivery_note = %(delivery_note)s AND docstatus = 1 AND
 			((from_case_no BETWEEN %(from_case_no)s AND %(to_case_no)s)