fix: validate shelf life for automatically created expiring batches (#58911)

Co-authored-by: Ajish18 <ajishiyappan1@gmail.com>

erpnext/stock/doctype/item/item.py

@@ -219,6 +219,7 @@ class Item(Document):
 		self.validate_conversion_factor()
 		self.validate_item_type()
 		self.validate_naming_series()
+		self.validate_shelf_life()
 		self.check_for_active_boms()
 		self.fill_customer_code()
 		self.check_item_tax()
@@ -398,6 +399,19 @@ class Item(Document):
 				).format(self.item_code)
 			)
 
+	def validate_shelf_life(self):
+		if (
+			self.has_batch_no
+			and self.has_expiry_date
+			and self.create_new_batch
+			and cint(self.shelf_life_in_days) <= 0
+		):
+			frappe.throw(
+				_("{0} must be greater than zero.").format(
+					self.get_label_from_fieldname("shelf_life_in_days")
+				)
+			)
+
 	def clear_retain_sample(self):
 		if not self.has_batch_no:
 			self.retain_sample = False