diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index d61e44b..5244777 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -7,6 +7,7 @@
 from frappe import _, throw
 from frappe.utils import (today, flt, cint, fmt_money, formatdate,
 	getdate, add_days, add_months, get_last_day, nowdate, get_link_to_form)
+from frappe.model.workflow import get_workflow_name, is_transition_condition_satisfied, WorkflowPermissionError
 from erpnext.stock.get_item_details import get_conversion_factor, get_item_details
 from erpnext.setup.utils import get_exchange_rate
 from erpnext.accounts.utils import get_fiscal_years, validate_fiscal_year, get_account_currency
@@ -1194,7 +1195,7 @@
 	child_item.base_amount = 1 # Initiallize value will update in parent validation
 	return child_item
 
-def check_and_delete_children(parent, data):
+def validate_and_delete_children(parent, data):
 	deleted_children = []
 	updated_item_names = [d.get("docname") for d in data]
 	for item in parent.items:
@@ -1221,18 +1222,37 @@
 
 @frappe.whitelist()
 def update_child_qty_rate(parent_doctype, trans_items, parent_doctype_name, child_docname="items"):
-	def check_permissions(doc, perm_type='create'):
+	def check_doc_permissions(doc, perm_type='create'):
 		try:
 			doc.check_permission(perm_type)
-		except:
-			action = "add" if perm_type == 'create' else "update"
-			frappe.throw(_("You do not have permissions to {} items in a Sales Order.").format(action), title=_("Insufficient Permissions"))
+		except frappe.PermissionError:
+			actions = { 'create': 'add', 'write': 'update', 'cancel': 'remove' }
+
+			frappe.throw(_("You do not have permissions to {} items in a {}.")
+				.format(actions[perm_type], parent_doctype), title=_("Insufficient Permissions"))
+	
+	def validate_workflow_conditions(doc):
+		workflow = get_workflow_name(doc.doctype)
+		if not workflow:
+			return
+
+		workflow_doc = frappe.get_doc("Workflow", workflow)
+		current_state = doc.get(workflow_doc.workflow_state_field)
+		roles = frappe.get_roles()
+
+		transitions = []
+		for transition in workflow_doc.transitions:
+			if transition.next_state == current_state and transition.allowed in roles:
+				if not is_transition_condition_satisfied(transition, doc):
+					continue
+				transitions.append(transition.as_dict())
+
+		if not transitions:
+			frappe.throw(_("You do not have workflow access to update this document."), title=_("Insufficient Workflow Permissions"))
 
 	def get_new_child_item(item_row):
-		if parent_doctype == "Sales Order":
-			return set_sales_order_defaults(parent_doctype, parent_doctype_name, child_docname, item_row)
-		if parent_doctype == "Purchase Order":
-			return set_purchase_order_defaults(parent_doctype, parent_doctype_name, child_docname, item_row)
+		new_child_function = set_sales_order_defaults if parent_doctype == "Sales Order" else set_purchase_order_defaults
+		return new_child_function(parent_doctype, parent_doctype_name, child_docname, item_row)
 
 	def validate_quantity(child_item, d):
 		if parent_doctype == "Sales Order" and flt(d.get("qty")) < flt(child_item.delivered_qty):
@@ -1245,17 +1265,18 @@
 
 	sales_doctypes = ['Sales Order', 'Sales Invoice', 'Delivery Note', 'Quotation']
 	parent = frappe.get_doc(parent_doctype, parent_doctype_name)
-
-	check_and_delete_children(parent, data)
+	
+	check_doc_permissions(parent, 'cancel')
+	validate_and_delete_children(parent, data)
 
 	for d in data:
 		new_child_flag = False
 		if not d.get("docname"):
 			new_child_flag = True
-			check_permissions(parent, 'create')
+			check_doc_permissions(parent, 'create')
 			child_item = get_new_child_item(d)
 		else:
-			check_permissions(parent, 'write')
+			check_doc_permissions(parent, 'write')
 			child_item = frappe.get_doc(parent_doctype + ' Item', d.get("docname"))
 
 			prev_rate, new_rate = flt(child_item.get("rate")), flt(d.get("rate"))
@@ -1362,6 +1383,9 @@
 		parent.update_prevdoc_status('submit')
 		parent.update_delivery_status()
 
+	parent.reload()
+	validate_workflow_conditions(parent)
+
 	parent.update_blanket_order()
 	parent.update_billing_percentage()
 	parent.set_status()
diff --git a/erpnext/selling/doctype/sales_order/test_sales_order.py b/erpnext/selling/doctype/sales_order/test_sales_order.py
index accaa9c..34aaf08 100644
--- a/erpnext/selling/doctype/sales_order/test_sales_order.py
+++ b/erpnext/selling/doctype/sales_order/test_sales_order.py
@@ -417,7 +417,42 @@
 		# add new item
 		trans_item = json.dumps([{'item_code' : '_Test Item', 'rate' : 100, 'qty' : 2}])
 		self.assertRaises(frappe.ValidationError, update_child_qty_rate,'Sales Order', trans_item, so.name)
+		test_user.remove_roles("Accounts User")
 		frappe.set_user("Administrator")
+	
+	def test_update_child_qty_rate_with_workflow(self):
+		from frappe.model.workflow import apply_workflow
+
+		workflow = make_sales_order_workflow()
+		so = make_sales_order(item_code= "_Test Item", qty=1, rate=150, do_not_submit=1)
+		apply_workflow(so, 'Approve')
+
+		frappe.set_user("Administrator")
+		user = 'test@example.com'
+		test_user = frappe.get_doc('User', user)
+		test_user.add_roles("Sales User", "Test Junior Approver")
+		frappe.set_user(user)
+
+		# user shouldn't be able to edit since grand_total will become > 200 if qty is doubled
+		trans_item = json.dumps([{'item_code' : '_Test Item', 'rate' : 150, 'qty' : 2, 'docname': so.items[0].name}])
+		self.assertRaises(frappe.ValidationError, update_child_qty_rate, 'Sales Order', trans_item, so.name)
+
+		frappe.set_user("Administrator")
+		user2 = 'test2@example.com'
+		test_user2 = frappe.get_doc('User', user2)
+		test_user2.add_roles("Sales User", "Test Approver")
+		frappe.set_user(user2)
+
+		# Test Approver is allowed to edit with grand_total > 200
+		update_child_qty_rate("Sales Order", trans_item, so.name)
+		so.reload()
+		self.assertEqual(so.items[0].qty, 2)
+
+		frappe.set_user("Administrator")
+		test_user.remove_roles("Sales User", "Test Junior Approver", "Test Approver")
+		test_user2.remove_roles("Sales User", "Test Junior Approver", "Test Approver")
+		workflow.is_active = 0
+		workflow.save()
 
 	def test_update_child_qty_rate_product_bundle(self):
 		# test Update Items with product bundle
@@ -973,3 +1008,37 @@
 		"reserved_qty"))
 
 test_dependencies = ["Currency Exchange"]
+
+def make_sales_order_workflow():
+	if frappe.db.exists('Workflow', 'SO Test Workflow'):
+		doc = frappe.get_doc("Workflow", "SO Test Workflow")
+		doc.set("is_active", 1)
+		doc.save()
+		return doc
+
+	frappe.get_doc(dict(doctype='Role', role_name='Test Junior Approver')).insert(ignore_if_duplicate=True)
+	frappe.get_doc(dict(doctype='Role', role_name='Test Approver')).insert(ignore_if_duplicate=True)
+	frappe.db.commit()
+	frappe.cache().hdel('roles', frappe.session.user)
+
+	workflow = frappe.get_doc({
+		"doctype": "Workflow",
+		"workflow_name": "SO Test Workflow",
+		"document_type": "Sales Order",
+		"workflow_state_field": "workflow_state",
+		"is_active": 1,
+		"send_email_alert": 0,
+	})
+	workflow.append('states', dict( state = 'Pending', allow_edit = 'All' ))
+	workflow.append('states', dict( state = 'Approved', allow_edit = 'Test Approver', doc_status = 1 ))
+	workflow.append('transitions', dict(
+		state = 'Pending', action = 'Approve', next_state = 'Approved', allowed = 'Test Junior Approver', allow_self_approval = 1,
+		condition = 'doc.grand_total < 200'
+	))
+	workflow.append('transitions', dict(
+		state = 'Pending', action = 'Approve', next_state = 'Approved', allowed = 'Test Approver', allow_self_approval = 1,
+		 condition = 'doc.grand_total > 200'
+	))
+	workflow.insert(ignore_permissions=True)
+
+	return workflow
\ No newline at end of file