diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index 20a064b..cd3d295 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -14,6 +14,7 @@
 class WarehouseNotSet(frappe.ValidationError): pass
 class ItemTemplateCannotHaveStock(frappe.ValidationError): pass
 class ItemVariantExistsError(frappe.ValidationError): pass
+class InvalidItemAttributeValueError(frappe.ValidationError): pass
 
 class Item(WebsiteGenerator):
 	website = frappe._dict(
@@ -351,9 +352,11 @@
 					frappe.throw(_("Please specify Attribute Value for attribute {0}").format(d.attribute))
 				args[d.attribute] = d.attribute_value
 
-			variant = get_variant(self.variant_of, args)
-			if variant and variant != self.name:
-				frappe.throw(_("Item variant {0} exists with same attributes").format(variant), ItemVariantExistsError)
+			if self.get("__islocal"):
+				# test this during insert because naming is based on item_code and we cannot use condition like self.name != variant
+				variant = get_variant(self.variant_of, args)
+				if variant:
+					frappe.throw(_("Item variant {0} exists with same attributes").format(variant), ItemVariantExistsError)
 
 def validate_end_of_life(item_code, end_of_life=None, verbose=1):
 	if not end_of_life:
@@ -510,8 +513,8 @@
 		filters={"parent": ["in", args.keys()]}):
 		(attribute_values.setdefault(t.parent, [])).append(t.attribute_value)
 
-	numeric_attributes = [t.name for t in frappe.get_list("Item Attribute", filters={"numeric_values":1,
-		"parent": ["in", args.keys()]})]
+	numeric_attributes = frappe._dict((t.name, t) for t in frappe.get_list("Item Attribute", filters={"numeric_values":1,
+		"name": ["in", args.keys()]}, fields=["name", "from_range", "to_range", "increment"]))
 
 	template_item = frappe.get_doc("Item", item)
 	template_item_attributes = frappe._dict((d.attribute, d) for d in template_item.attributes)
@@ -519,18 +522,19 @@
 	for attribute, value in args.items():
 
 		if attribute in numeric_attributes:
-			template_attribute = template_item_attributes[attribute]
+			numeric_attribute = numeric_attributes[attribute]
 
-			if template_attribute.increment == 0:
+			from_range = numeric_attribute.from_range
+			to_range = numeric_attribute.to_range
+			increment = numeric_attribute.increment
+
+			if increment == 0:
 				# defensive validation to prevent ZeroDivisionError
 				frappe.throw(_("Increment for Attribute {0} cannot be 0").format(attribute))
 
-			from_range = template_attribute.from_range
-			to_range = template_attribute.to_range
-			increment = template_attribute.increment
 
 			if not ( (from_range <= flt(value) <= to_range) and (flt(value) - from_range) % increment == 0 ):
-				frappe.throw(_("Value for Attribute {0} must be within the range of {1} to {2} in the increments of {3}").format(attribute, from_range, to_range, increment))
+				frappe.throw(_("Value for Attribute {0} must be within the range of {1} to {2} in the increments of {3}").format(attribute, from_range, to_range, increment), InvalidItemAttributeValueError)
 
 		elif value not in attribute_values[attribute]:
 			frappe.throw(_("Value {0} for Attribute {1} does not exist in the list of valid Item Attribute Values").format(
@@ -538,7 +542,7 @@
 
 def find_variant(item, args):
 	conditions = ["""(iv_attribute.attribute="{0}" and iv_attribute.attribute_value="{1}")"""\
-		.format(frappe.db.escape(key), frappe.db.escape(value)) for key, value in args.items()]
+		.format(frappe.db.escape(key), frappe.db.escape(cstr(value))) for key, value in args.items()]
 
 	conditions = " or ".join(conditions)
 
diff --git a/erpnext/stock/doctype/item/test_item.py b/erpnext/stock/doctype/item/test_item.py
index 428bd37..2ba9647 100644
--- a/erpnext/stock/doctype/item/test_item.py
+++ b/erpnext/stock/doctype/item/test_item.py
@@ -6,7 +6,8 @@
 import frappe
 
 from frappe.test_runner import make_test_records
-from erpnext.stock.doctype.item.item import WarehouseNotSet, ItemTemplateCannotHaveStock, create_variant, ItemVariantExistsError
+from erpnext.stock.doctype.item.item import (WarehouseNotSet, ItemTemplateCannotHaveStock, create_variant,
+	ItemVariantExistsError, InvalidItemAttributeValueError)
 from erpnext.stock.doctype.stock_entry.test_stock_entry import make_stock_entry
 
 test_ignore = ["BOM"]
@@ -100,21 +101,52 @@
 			self.assertEquals(value, details.get(key))
 
 	def test_make_item_variant(self):
-		if frappe.db.exists("Item", "_Test Variant Item-L"):
-			frappe.delete_doc("Item", "_Test Variant Item-L")
-			frappe.delete_doc("Item", "_Test Variant Item-L2")
+		frappe.delete_doc_if_exists("Item", "_Test Variant Item-L")
 
-		variant = create_variant("_Test Variant Item", """{"Test Size": "Large"}""")
-		variant.item_code = "_Test Variant Item-L"
-		variant.item_name = "_Test Variant Item-L"
+		variant = create_variant("_Test Variant Item", {"Test Size": "Large"})
 		variant.save()
 
 		# doing it again should raise error
-		variant = create_variant("_Test Variant Item", """{"Test Size": "Large"}""")
-		variant.item_code = "_Test Variant Item-L2"
-		variant.item_name = "_Test Variant Item-L2"
+		variant = create_variant("_Test Variant Item", {"Test Size": "Large"})
 		self.assertRaises(ItemVariantExistsError, variant.save)
 
+	def test_make_item_variant_with_numeric_values(self):
+		# cleanup
+		frappe.delete_doc_if_exists("Item", "_Test Numeric Template Item")
+		frappe.delete_doc_if_exists("Item", "_Test Numeric Variant-L-1.5")
+		frappe.delete_doc_if_exists("Item Attribute", "Test Item Length")
+
+		# make item attribute
+		frappe.get_doc({
+			"doctype": "Item Attribute",
+			"attribute_name": "Test Item Length",
+			"numeric_values": 1,
+			"from_range": 0.0,
+			"to_range": 100.0,
+			"increment": 0.5
+		}).insert()
+
+		# make template item
+		make_item("_Test Numeric Template Item", {
+			"attributes": [
+				{"attribute": "Test Size"},
+				{"attribute": "Test Item Length"}
+			],
+			"default_warehouse": "_Test Warehouse - _TC"
+		})
+
+		variant = create_variant("_Test Numeric Template Item", {"Test Size": "Large", "Test Item Length": 1.1})
+		self.assertEquals(variant.item_code, None)
+		variant.item_code = "_Test Numeric Variant-L-1.1"
+		variant.item_name = "_Test Numeric Variant Large 1.1m"
+		self.assertRaises(InvalidItemAttributeValueError, variant.save)
+
+		variant = create_variant("_Test Numeric Template Item", {"Test Size": "Large", "Test Item Length": 1.5})
+		self.assertEquals(variant.item_code, None)
+		variant.item_code = "_Test Numeric Variant-L-1.5"
+		variant.item_name = "_Test Numeric Variant Large 1.5m"
+		variant.save()
+
 def make_item_variant():
 	if not frappe.db.exists("Item", "_Test Variant Item-S"):
 		variant = create_variant("_Test Variant Item", """{"Test Size": "Small"}""")
diff --git a/erpnext/stock/doctype/item_attribute/item_attribute.py b/erpnext/stock/doctype/item_attribute/item_attribute.py
index a82a3a8..8310288 100644
--- a/erpnext/stock/doctype/item_attribute/item_attribute.py
+++ b/erpnext/stock/doctype/item_attribute/item_attribute.py
@@ -6,6 +6,8 @@
 from frappe.model.document import Document
 from frappe import _
 
+class ItemAttributeIncrementError(frappe.ValidationError): pass
+
 class ItemAttribute(Document):
 	def validate(self):
 		self.validate_numeric()
@@ -15,14 +17,14 @@
 	def validate_numeric(self):
 		if self.numeric_values:
 			self.set("item_attribute_values", [])
-			if not self.from_range or not self.to_range:
+			if self.from_range is None or self.to_range is None:
 				frappe.throw(_("Please specify from/to range"))
 
-			elif self.from_range > self.to_range:
-				frappe.throw(_("From Range cannot be greater than to Range"))
+			elif self.from_range >= self.to_range:
+				frappe.throw(_("From Range has to be less than To Range"))
 
 			if not self.increment:
-				frappe.throw(_("Increment cannot be 0"))
+				frappe.throw(_("Increment cannot be 0"), ItemAttributeIncrementError)
 		else:
 			self.from_range = self.to_range = self.increment = 0
 
diff --git a/erpnext/stock/doctype/item_attribute/test_item_attribute.py b/erpnext/stock/doctype/item_attribute/test_item_attribute.py
index 31b3b0a..8b73d46 100644
--- a/erpnext/stock/doctype/item_attribute/test_item_attribute.py
+++ b/erpnext/stock/doctype/item_attribute/test_item_attribute.py
@@ -6,5 +6,25 @@
 
 test_records = frappe.get_test_records('Item Attribute')
 
+from .item_attribute import ItemAttributeIncrementError
+
 class TestItemAttribute(unittest.TestCase):
-	pass
+	def setUp(self):
+		if frappe.db.exists("Item Attribute", "_Test_Length"):
+			frappe.delete_doc("Item Attribute", "_Test_Length")
+
+	def test_numeric_item_attribute(self):
+		item_attribute = frappe.get_doc({
+			"doctype": "Item Attribute",
+			"attribute_name": "_Test_Length",
+			"numeric_values": 1,
+			"from_range": 0.0,
+			"to_range": 100.0,
+			"increment": 0
+		})
+
+		self.assertRaises(ItemAttributeIncrementError, item_attribute.save)
+
+		item_attribute.increment = 0.5
+		item_attribute.save()
+