fix: multiple pricing rules are not working on selling side

erpnext/accounts/doctype/pricing_rule/pricing_rule.py

@@ -60,6 +60,15 @@ class PricingRule(Document):
 		if self.price_or_product_discount == 'Price' and not self.rate_or_discount:
 			throw(_("Rate or Discount is required for the price discount."), frappe.MandatoryError)
 
+		if self.apply_discount_on_rate:
+			if not self.priority:
+				throw(_("As the field {0} is enabled, the field {1} is mandatory.")
+					.format(frappe.bold("Apply Discount on Discounted Rate"), frappe.bold("Priority")))
+
+			if self.priority and cint(self.priority) == 1:
+				throw(_("As the field {0} is enabled, the value of the field {1} should be more than 1.")
+					.format(frappe.bold("Apply Discount on Discounted Rate"), frappe.bold("Priority")))
+
 	def validate_applicable_for_selling_or_buying(self):
 		if not self.selling and not self.buying:
 			throw(_("Atleast one of the Selling or Buying must be selected"))
@@ -226,12 +235,11 @@ def get_pricing_rule_for_item(args, price_list_rate=0, doc=None, for_validate=Fa
 
 	item_details = frappe._dict({
 		"doctype": args.doctype,
+		"has_margin": False,
 		"name": args.name,
 		"parent": args.parent,
 		"parenttype": args.parenttype,
-		"child_docname": args.get('child_docname'),
+		"child_docname": args.get('child_docname')
-		"discount_percentage_on_rate": [],
-		"discount_amount_on_rate": []
 	})
 
 	if args.ignore_pricing_rule or not args.item_code:
@@ -279,6 +287,10 @@ def get_pricing_rule_for_item(args, price_list_rate=0, doc=None, for_validate=Fa
 				else:
 					get_product_discount_rule(pricing_rule, item_details, args, doc)
 
+		if not item_details.get("has_margin"):
+			item_details.margin_type = None
+			item_details.margin_rate_or_amount = 0.0
+
 		item_details.has_pricing_rule = 1
 
 		item_details.pricing_rules = frappe.as_json([d.pricing_rule for d in rules])
@@ -330,13 +342,11 @@ def get_pricing_rule_details(args, pricing_rule):
 def apply_price_discount_rule(pricing_rule, item_details, args):
 	item_details.pricing_rule_for = pricing_rule.rate_or_discount
 
-	if ((pricing_rule.margin_type == 'Amount' and pricing_rule.currency == args.currency)
+	if ((pricing_rule.margin_type in ['Amount', 'Percentage'] and pricing_rule.currency == args.currency)
 			or (pricing_rule.margin_type == 'Percentage')):
 		item_details.margin_type = pricing_rule.margin_type
 		item_details.margin_rate_or_amount = pricing_rule.margin_rate_or_amount
-	else:
+		item_details.has_margin = True
-		item_details.margin_type = None
-		item_details.margin_rate_or_amount = 0.0
 
 	if pricing_rule.rate_or_discount == 'Rate':
 		pricing_rule_rate = 0.0
@@ -351,9 +361,9 @@ def apply_price_discount_rule(pricing_rule, item_details, args):
 		if pricing_rule.rate_or_discount != apply_on: continue
 
 		field = frappe.scrub(apply_on)
-		if pricing_rule.apply_discount_on_rate:
+		if pricing_rule.apply_discount_on_rate and item_details.get("discount_percentage"):
-			discount_field = "{0}_on_rate".format(field)
+			# Apply discount on discounted rate
-			item_details[discount_field].append(pricing_rule.get(field, 0))
+			item_details[field] += ((100 - item_details[field]) * (pricing_rule.get(field, 0) / 100))
 		else:
 			if field not in item_details:
 				item_details.setdefault(field, 0)
@@ -361,14 +371,6 @@ def apply_price_discount_rule(pricing_rule, item_details, args):
 			item_details[field] += (pricing_rule.get(field, 0)
 				if pricing_rule else args.get(field, 0))
 
-def set_discount_amount(rate, item_details):
-	for field in ['discount_percentage_on_rate', 'discount_amount_on_rate']:
-		for d in item_details.get(field):
-			dis_amount = (rate * d / 100
-				if field == 'discount_percentage_on_rate' else d)
-			rate -= dis_amount
-			item_details.rate = rate
-
 def remove_pricing_rule_for_item(pricing_rules, item_details, item_code=None):
 	from erpnext.accounts.doctype.pricing_rule.utils import (get_applied_pricing_rules,
 		get_pricing_rule_items)

erpnext/accounts/doctype/pricing_rule/utils.py

@@ -42,6 +42,7 @@ def get_pricing_rules(args, doc=None):
 	if not pricing_rules: return []
 
 	if apply_multiple_pricing_rules(pricing_rules):
+		pricing_rules = sorted_by_priority(pricing_rules)
 		for pricing_rule in pricing_rules:
 			pricing_rule = filter_pricing_rules(args, pricing_rule, doc)
 			if pricing_rule:
@@ -53,6 +54,20 @@ def get_pricing_rules(args, doc=None):
 
 	return rules
 
+def sorted_by_priority(pricing_rules):
+	# If more than one pricing rules, then sort by priority
+	pricing_rules_list = []
+	pricing_rule_dict = {}
+	for pricing_rule in pricing_rules:
+		if not pricing_rule.get("priority"): continue
+
+		pricing_rule_dict.setdefault(cint(pricing_rule.get("priority")), []).append(pricing_rule)
+
+	for key in sorted(pricing_rule_dict):
+		pricing_rules_list.append(pricing_rule_dict.get(key))
+
+	return pricing_rules_list or pricing_rules
+
 def filter_pricing_rule_based_on_condition(pricing_rules, doc=None):
 	filtered_pricing_rules = []
 	if doc:

erpnext/controllers/accounts_controller.py

@@ -263,6 +263,7 @@ class AccountsController(TransactionBase):
 			if self.doctype == "Quotation" and self.quotation_to == "Customer" and parent_dict.get("party_name"):
 				parent_dict.update({"customer": parent_dict.get("party_name")})
 
+			self.pricing_rules = []
 			for item in self.get("items"):
 				if item.get("item_code"):
 					args = parent_dict.copy()
@@ -301,6 +302,7 @@ class AccountsController(TransactionBase):
 
 					if ret.get("pricing_rules"):
 						self.apply_pricing_rule_on_items(item, ret)
+						self.set_pricing_rule_details(item, ret)
 
 			if self.doctype == "Purchase Invoice":
 				self.set_expense_account(for_validate)
@@ -322,6 +324,9 @@ class AccountsController(TransactionBase):
 					if item.get('discount_amount'):
 						item.rate = item.price_list_rate - item.discount_amount
 
+				if item.get("apply_discount_on_discounted_rate") and pricing_rule_args.get("rate"):
+					item.rate = pricing_rule_args.get("rate")
+
 			elif pricing_rule_args.get('free_item_data'):
 				apply_pricing_rule_for_free_items(self, pricing_rule_args.get('free_item_data'))
 
@@ -335,6 +340,18 @@ class AccountsController(TransactionBase):
 						frappe.msgprint(_("Row {0}: user has not applied the rule {1} on the item {2}")
 							.format(item.idx, frappe.bold(title), frappe.bold(item.item_code)))
 
+	def set_pricing_rule_details(self, item_row, args):
+		pricing_rules = get_applied_pricing_rules(args.get("pricing_rules"))
+		if not pricing_rules: return
+
+		for pricing_rule in pricing_rules:
+			self.append("pricing_rules", {
+				"pricing_rule": pricing_rule,
+				"item_code": item_row.item_code,
+				"child_docname": item_row.name,
+				"rule_applied": True
+			})
+
 	def set_taxes(self):
 		if not self.meta.get_field("taxes"):
 			return

erpnext/controllers/taxes_and_totals.py

@@ -608,16 +608,19 @@ class calculate_taxes_and_totals(object):
 		base_rate_with_margin = 0.0
 		if item.price_list_rate:
 			if item.pricing_rules and not self.doc.ignore_pricing_rule:
+				has_margin = False
 				for d in get_applied_pricing_rules(item.pricing_rules):
 					pricing_rule = frappe.get_cached_doc('Pricing Rule', d)
 
-					if (pricing_rule.margin_type == 'Amount' and pricing_rule.currency == self.doc.currency)\
+					if (pricing_rule.margin_type in ['Amount', 'Percentage'] and pricing_rule.currency == self.doc.currency)\
 							or (pricing_rule.margin_type == 'Percentage'):
 						item.margin_type = pricing_rule.margin_type
 						item.margin_rate_or_amount = pricing_rule.margin_rate_or_amount
-					else:
+						has_margin = True
-						item.margin_type = None
+
-						item.margin_rate_or_amount = 0.0
+				if not has_margin:
+					item.margin_type = None
+					item.margin_rate_or_amount = 0.0
 
 			if item.margin_type and item.margin_rate_or_amount:
 				margin_value = item.margin_rate_or_amount if item.margin_type == 'Amount' else flt(item.price_list_rate) * flt(item.margin_rate_or_amount) / 100