refactor: checkbox to toggle exchange rate inheritence in PO->PI

erpnext/accounts/doctype/purchase_invoice/purchase_invoice.json

@@ -36,6 +36,7 @@
   "currency_and_price_list",
   "currency",
   "conversion_rate",
+  "use_transaction_date_exchange_rate",
   "column_break2",
   "buying_price_list",
   "price_list_currency",
@@ -1588,13 +1589,20 @@
    "label": "Repost Required",
    "options": "Account",
    "read_only": 1
+  },
+  {
+   "default": "0",
+   "fieldname": "use_transaction_date_exchange_rate",
+   "fieldtype": "Check",
+   "label": "Use Transaction Date Exchange Rate",
+   "read_only": 1
   }
  ],
  "icon": "fa fa-file-text",
  "idx": 204,
  "is_submittable": 1,
  "links": [],
- "modified": "2023-10-01 21:01:47.282533",
+ "modified": "2023-10-16 16:24:51.886231",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Purchase Invoice",

erpnext/buying/doctype/buying_settings/buying_settings.json

@@ -24,6 +24,7 @@
   "bill_for_rejected_quantity_in_purchase_invoice",
   "disable_last_purchase_rate",
   "show_pay_button",
+  "use_transaction_date_exchange_rate",
   "subcontract",
   "backflush_raw_materials_of_subcontract_based_on",
   "column_break_11",
@@ -164,6 +165,13 @@
    "fieldname": "over_order_allowance",
    "fieldtype": "Float",
    "label": "Over Order Allowance (%)"
+  },
+  {
+   "default": "0",
+   "description": "While making Purchase Invoice from Purchase Order, use Exchange Rate on Invoice's transaction date rather than inheriting it from Purchase Order. Only applies for Purchase Invoice.",
+   "fieldname": "use_transaction_date_exchange_rate",
+   "fieldtype": "Check",
+   "label": "Use Transaction Date Exchange Rate"
   }
  ],
  "icon": "fa fa-cog",
@@ -171,7 +179,7 @@
  "index_web_pages_for_search": 1,
  "issingle": 1,
  "links": [],
- "modified": "2023-03-02 17:02:14.404622",
+ "modified": "2023-10-16 16:22:03.201078",
  "modified_by": "Administrator",
  "module": "Buying",
  "name": "Buying Settings",

erpnext/controllers/accounts_controller.py

@@ -572,6 +572,17 @@ class AccountsController(TransactionBase):
 					self.currency, self.company_currency, transaction_date, args
 				)
 
+			if (
+				self.currency
+				and buying_or_selling == "Buying"
+				and frappe.db.get_single_value("Buying Settings", "use_transaction_date_exchange_rate")
+				and self.doctype == "Purchase Invoice"
+			):
+				self.use_transaction_date_exchange_rate = True
+				self.conversion_rate = get_exchange_rate(
+					self.currency, self.company_currency, transaction_date, args
+				)
+
 	def set_missing_item_details(self, for_validate=False):
 		"""set missing item values"""
 		from erpnext.stock.doctype.serial_no.serial_no import get_serial_nos