diff --git a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
index 57f9f83..83045ea 100644
--- a/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
+++ b/erpnext/accounts/doctype/pricing_rule/pricing_rule.py
@@ -348,6 +348,8 @@
 	return filtered_rules or pricing_rules
 
 def set_transaction_type(args):
+	if args.transaction_type:
+		return
 	if args.doctype in ("Opportunity", "Quotation", "Sales Order", "Delivery Note", "Sales Invoice"):
 		args.transaction_type = "selling"
 	elif args.doctype in ("Material Request", "Supplier Quotation", "Purchase Order",
@@ -356,4 +358,4 @@
 	elif args.customer:
 		args.transaction_type = "selling"
 	else:
-		args.transaction_type = "buying"
\ No newline at end of file
+		args.transaction_type = "buying"