fix: disable pricing rules for internal transfers (#31034)

* fix: disable pricing rules for internal transfers

* fix: only apply validation on internal transfers

Co-authored-by: Marica <maricadsouza221197@gmail.com>

* fix: internal_party_field undefined

Co-authored-by: Marica <maricadsouza221197@gmail.com>

erpnext/controllers/accounts_controller.py

@@ -148,6 +148,7 @@ class AccountsController(TransactionBase):
 
 		self.validate_inter_company_reference()
 
+		self.disable_pricing_rule_on_internal_transfer()
 		self.set_incoming_rate()
 
 		if self.meta.get_field("currency"):
@@ -382,6 +383,14 @@ class AccountsController(TransactionBase):
 				msg += _("Please create purchase from internal sale or delivery document itself")
 				frappe.throw(msg, title=_("Internal Sales Reference Missing"))
 
+	def disable_pricing_rule_on_internal_transfer(self):
+		if not self.get("ignore_pricing_rule") and self.is_internal_transfer():
+			self.ignore_pricing_rule = 1
+			frappe.msgprint(
+				_("Disabled pricing rules since this {} is an internal transfer").format(self.doctype),
+				alert=1,
+			)
+
 	def validate_due_date(self):
 		if self.get("is_pos"):
 			return
@@ -1738,6 +1747,8 @@ class AccountsController(TransactionBase):
 			internal_party_field = "is_internal_customer"
 		elif self.doctype in ("Purchase Invoice", "Purchase Receipt", "Purchase Order"):
 			internal_party_field = "is_internal_supplier"
+		else:
+			return False
 
 		if self.get(internal_party_field) and (self.represents_company == self.company):
 			return True