Updated Spelling Maxiumm to Maximum (#15090)

diff --git a/erpnext/controllers/selling_controller.py b/erpnext/controllers/selling_controller.py
index a1e2919..748fe59 100644
--- a/erpnext/controllers/selling_controller.py
+++ b/erpnext/controllers/selling_controller.py
@@ -141,7 +141,7 @@
 			discount = flt(frappe.db.get_value("Item", d.item_code, "max_discount"))
 
 			if discount and flt(d.discount_percentage) > discount:
-				frappe.throw(_("Maxiumm discount for Item {0} is {1}%").format(d.item_code, discount))
+				frappe.throw(_("Maximum discount for Item {0} is {1}%").format(d.item_code, discount))
 
 	def set_qty_as_per_stock_uom(self):
 		for d in self.get("items"):