fix: per_billed for return DN (backport #30868) (#30971)

This is a semi-automatic backport of pull request #30868 done by [Mergify](https://mergify.com).

erpnext/patches.txt

@@ -364,3 +364,4 @@ erpnext.patches.v13_0.copy_custom_field_filters_to_website_item
 erpnext.patches.v13_0.set_available_for_use_date_if_missing
 erpnext.patches.v13_0.education_deprecation_warning
 erpnext.patches.v13_0.create_accounting_dimensions_in_orders
+erpnext.patches.v13_0.set_per_billed_in_return_delivery_note

erpnext/patches/v13_0/set_per_billed_in_return_delivery_note.py

@@ -0,0 +1,29 @@
+# Copyright (c) 2022, Frappe Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+import frappe
+
+
+def execute():
+	dn = frappe.qb.DocType("Delivery Note")
+	dn_item = frappe.qb.DocType("Delivery Note Item")
+
+	dn_list = (
+		frappe.qb.from_(dn)
+		.inner_join(dn_item)
+		.on(dn.name == dn_item.parent)
+		.select(dn.name)
+		.where(dn.docstatus == 1)
+		.where(dn.is_return == 1)
+		.where(dn.per_billed < 100)
+		.where(dn_item.returned_qty > 0)
+		.run(as_dict=True)
+	)
+
+	frappe.qb.update(dn_item).inner_join(dn).on(dn.name == dn_item.parent).set(
+		dn_item.returned_qty, 0
+	).where(dn.is_return == 1).where(dn_item.returned_qty > 0).run()
+
+	for d in dn_list:
+		dn_doc = frappe.get_doc("Delivery Note", d.get("name"))
+		dn_doc.run_method("update_billing_status")

erpnext/stock/doctype/delivery_note/test_delivery_note.py

@@ -962,6 +962,44 @@ def test_payment_terms_are_fetched_when_creating_sales_invoice(self):
 
 		automatically_fetch_payment_terms(enable=0)
 
+	def test_returned_qty_in_return_dn(self):
+		# SO ---> SI ---> DN
+		#                 |
+		#                 |---> DN(Partial Sales Return) ---> SI(Credit Note)
+		#                 |
+		#                 |---> DN(Partial Sales Return) ---> SI(Credit Note)
+
+		from erpnext.accounts.doctype.sales_invoice.sales_invoice import make_delivery_note
+		from erpnext.selling.doctype.sales_order.sales_order import make_sales_invoice
+
+		so = make_sales_order(qty=10)
+		si = make_sales_invoice(so.name)
+		si.insert()
+		si.submit()
+		dn = make_delivery_note(si.name)
+		dn.insert()
+		dn.submit()
+		self.assertEqual(dn.items[0].returned_qty, 0)
+		self.assertEqual(dn.per_billed, 100)
+
+		from erpnext.stock.doctype.delivery_note.delivery_note import make_sales_invoice
+
+		dn1 = create_delivery_note(is_return=1, return_against=dn.name, qty=-3)
+		si1 = make_sales_invoice(dn1.name)
+		si1.insert()
+		si1.submit()
+		dn1.reload()
+		self.assertEqual(dn1.items[0].returned_qty, 0)
+		self.assertEqual(dn1.per_billed, 100)
+
+		dn2 = create_delivery_note(is_return=1, return_against=dn.name, qty=-4)
+		si2 = make_sales_invoice(dn2.name)
+		si2.insert()
+		si2.submit()
+		dn2.reload()
+		self.assertEqual(dn2.items[0].returned_qty, 0)
+		self.assertEqual(dn2.per_billed, 100)
+
 
 def create_delivery_note(**args):
 	dn = frappe.new_doc("Delivery Note")

erpnext/stock/doctype/delivery_note_item/delivery_note_item.json

@@ -737,7 +737,9 @@
    "depends_on": "returned_qty",
    "fieldname": "returned_qty",
    "fieldtype": "Float",
-   "label": "Returned Qty in Stock UOM"
+   "label": "Returned Qty in Stock UOM",
+   "no_copy": 1,
+   "read_only": 1
   },
   {
    "fieldname": "incoming_rate",
@@ -778,7 +780,7 @@
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2022-03-31 18:36:24.671913",
+ "modified": "2022-05-02 12:09:39.610075",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Delivery Note Item",