diff --git a/erpnext/manufacturing/doctype/blanket_order/blanket_order.py b/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
index dcf122c..5656486 100644
--- a/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
+++ b/erpnext/manufacturing/doctype/blanket_order/blanket_order.py
@@ -41,11 +41,50 @@
 	def validate(self):
 		self.validate_dates()
 		self.validate_duplicate_items()
+		self.set_party_item_code()
 
 	def validate_dates(self):
 		if getdate(self.from_date) > getdate(self.to_date):
 			frappe.throw(_("From date cannot be greater than To date"))
 
+	def set_party_item_code(self):
+		item_ref = {}
+		if self.blanket_order_type == "Selling":
+			item_ref = self.get_customer_items_ref()
+			print(item_ref)
+		else:
+			item_ref = self.get_supplier_items_ref()
+
+		if not item_ref:
+			return
+
+		for row in self.items:
+			row.party_item_code = item_ref.get(row.item_code)
+
+	def get_customer_items_ref(self):
+		items = [d.item_code for d in self.items]
+
+		return frappe._dict(
+			frappe.get_all(
+				"Item Customer Detail",
+				filters={"parent": ("in", items), "customer_name": self.customer},
+				fields=["parent", "ref_code"],
+				as_list=True,
+			)
+		)
+
+	def get_supplier_items_ref(self):
+		items = [d.item_code for d in self.items]
+
+		return frappe._dict(
+			frappe.get_all(
+				"Item Supplier",
+				filters={"parent": ("in", items), "supplier": self.supplier},
+				fields=["parent", "supplier_part_no"],
+				as_list=True,
+			)
+		)
+
 	def validate_duplicate_items(self):
 		item_list = []
 		for item in self.items:
diff --git a/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py b/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
index e9fc25b..3f3b6f0 100644
--- a/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
+++ b/erpnext/manufacturing/doctype/blanket_order/test_blanket_order.py
@@ -5,6 +5,7 @@
 from frappe.utils import add_months, today
 
 from erpnext import get_company_currency
+from erpnext.stock.doctype.item.test_item import make_item
 
 from .blanket_order import make_order
 
@@ -90,6 +91,30 @@
 		frappe.db.set_single_value("Buying Settings", "blanket_order_allowance", 10)
 		po.submit()
 
+	def test_party_item_code(self):
+		item_doc = make_item("_Test Item 1 for Blanket Order")
+		item_code = item_doc.name
+
+		customer = "_Test Customer"
+		supplier = "_Test Supplier"
+
+		if not frappe.db.exists(
+			"Item Customer Detail", {"customer_name": customer, "parent": item_code}
+		):
+			item_doc.append("customer_items", {"customer_name": customer, "ref_code": "CUST-REF-1"})
+			item_doc.save()
+
+		if not frappe.db.exists("Item Supplier", {"supplier": supplier, "parent": item_code}):
+			item_doc.append("supplier_items", {"supplier": supplier, "supplier_part_no": "SUPP-PART-1"})
+			item_doc.save()
+
+		# Blanket Order for Selling
+		bo = make_blanket_order(blanket_order_type="Selling", customer=customer, item_code=item_code)
+		self.assertEqual(bo.items[0].party_item_code, "CUST-REF-1")
+
+		bo = make_blanket_order(blanket_order_type="Purchasing", supplier=supplier, item_code=item_code)
+		self.assertEqual(bo.items[0].party_item_code, "SUPP-PART-1")
+
 
 def make_blanket_order(**args):
 	args = frappe._dict(args)
diff --git a/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.json b/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.json
index 977ad54..aa7831f 100644
--- a/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.json
+++ b/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.json
@@ -1,4 +1,5 @@
 {
+ "actions": [],
  "creation": "2018-05-24 07:20:04.255236",
  "doctype": "DocType",
  "editable_grid": 1,
@@ -6,6 +7,7 @@
  "field_order": [
   "item_code",
   "item_name",
+  "party_item_code",
   "column_break_3",
   "qty",
   "rate",
@@ -62,10 +64,17 @@
    "fieldname": "terms_and_conditions",
    "fieldtype": "Text",
    "label": "Terms and Conditions"
+  },
+  {
+   "fieldname": "party_item_code",
+   "fieldtype": "Data",
+   "label": "Party Item Code",
+   "read_only": 1
   }
  ],
  "istable": 1,
- "modified": "2019-11-18 19:37:46.245878",
+ "links": [],
+ "modified": "2024-02-14 18:25:26.479672",
  "modified_by": "Administrator",
  "module": "Manufacturing",
  "name": "Blanket Order Item",
@@ -74,5 +83,6 @@
  "quick_entry": 1,
  "sort_field": "modified",
  "sort_order": "DESC",
+ "states": [],
  "track_changes": 1
 }
\ No newline at end of file
diff --git a/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.py b/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.py
index 068c2e9..316d294 100644
--- a/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.py
+++ b/erpnext/manufacturing/doctype/blanket_order_item/blanket_order_item.py
@@ -20,6 +20,7 @@
 		parent: DF.Data
 		parentfield: DF.Data
 		parenttype: DF.Data
+		party_item_code: DF.Data | None
 		qty: DF.Float
 		rate: DF.Currency
 		terms_and_conditions: DF.Text | None