refactor: handle opening round off on purchase invoice

(cherry picked from commit a5d6a25a96)

erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py

@@ -1545,6 +1545,21 @@ class PurchaseInvoice(BuyingController):
 				self.company, "Purchase Invoice", self.name, self.use_company_roundoff_cost_center
 			)
 
+			if self.is_opening == "Yes" and self.rounding_adjustment:
+				if not round_off_for_opening:
+					frappe.throw(
+						_(
+							"Opening Invoice has rounding adjustment of {0}.<br><br> '{1}' account is required to post these values. Please set it in Company: {2}.<br><br> Or, '{3}' can be enabled to not post any rounding adjustment."
+						).format(
+							frappe.bold(self.rounding_adjustment),
+							frappe.bold("Round Off for Opening"),
+							get_link_to_form("Company", self.company),
+							frappe.bold("Disable Rounded Total"),
+						)
+					)
+				else:
+					round_off_account = round_off_for_opening
+
 			gl_entries.append(
 				self.get_gl_dict(
 					{