refactor: use common functionality to validate account number (#42842)

feat: Allow unique Account number by root type (not unique for accros all Accounts)

erpnext/accounts/doctype/account/account.py

@@ -102,14 +102,12 @@ def autoname(self):
 		self.name = get_autoname_with_number(self.account_number, self.account_name, self.company)
 
 	def validate(self):
-		from erpnext.accounts.utils import validate_field_number
-
 		if frappe.local.flags.allow_unverified_charts:
 			return
 		self.validate_parent()
 		self.validate_parent_child_account_type()
 		self.validate_root_details()
-		validate_field_number("Account", self.name, self.account_number, self.company, "account_number")
+		self.validate_account_number()
 		self.validate_group_or_ledger()
 		self.set_root_and_report_type()
 		self.validate_mandatory()
@@ -310,6 +308,22 @@ def validate_account_currency(self):
 			if frappe.db.get_value("GL Entry", {"account": self.name}):
 				frappe.throw(_("Currency can not be changed after making entries using some other currency"))
 
+	def validate_account_number(self, account_number=None):
+		if not account_number:
+			account_number = self.account_number
+
+		if account_number:
+			account_with_same_number = frappe.db.get_value(
+				"Account",
+				{"account_number": account_number, "company": self.company, "name": ["!=", self.name]},
+			)
+			if account_with_same_number:
+				frappe.throw(
+					_("Account Number {0} already used in account {1}").format(
+						account_number, account_with_same_number
+					)
+				)
+
 	def create_account_for_child_company(self, parent_acc_name_map, descendants, parent_acc_name):
 		for company in descendants:
 			company_bold = frappe.bold(company)
@@ -463,19 +477,6 @@ def get_account_autoname(account_number, account_name, company):
 	return " - ".join(parts)
 
 
-def validate_account_number(name, account_number, company):
-	if account_number:
-		account_with_same_number = frappe.db.get_value(
-			"Account", {"account_number": account_number, "company": company, "name": ["!=", name]}
-		)
-		if account_with_same_number:
-			frappe.throw(
-				_("Account Number {0} already used in account {1}").format(
-					account_number, account_with_same_number
-				)
-			)
-
-
 @frappe.whitelist()
 def update_account_number(name, account_name, account_number=None, from_descendant=False):
 	account = frappe.get_cached_doc("Account", name)
@@ -516,7 +517,7 @@ def update_account_number(name, account_name, account_number=None, from_descenda
 
 				frappe.throw(message, title=_("Rename Not Allowed"))
 
-	validate_account_number(name, account_number, account.company)
+	account.validate_account_number(account_number)
 	if account_number:
 		frappe.db.set_value("Account", name, "account_number", account_number.strip())
 	else: