diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index 637a86846f9..a27689d6052 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -319,6 +319,38 @@ class PurchaseOrder(BuyingController):
 					).format(item_code, flt(qty, precision), itemwise_min_order_qty.get(item_code))
 				)
 
+		self.warn_marginal_min_order_qty(itemwise_qty, itemwise_min_order_qty)
+
+	def warn_marginal_min_order_qty(self, itemwise_qty, itemwise_min_order_qty):
+		"""Toast when an item's ordered qty exceeds its minimum only by purchase UOM rounding."""
+		if not self.is_new():
+			return
+
+		precision = self.items[0].precision("stock_qty")
+		itemwise_step = frappe._dict()
+		itemwise_stock_uom = frappe._dict()
+		for d in self.get("items"):
+			step = 10 ** -d.precision("qty") * flt(d.conversion_factor)
+			itemwise_step[d.item_code] = max(itemwise_step.get(d.item_code, 0), step)
+			itemwise_stock_uom[d.item_code] = d.stock_uom
+
+		for item_code, qty in itemwise_qty.items():
+			min_order_qty = flt(itemwise_min_order_qty.get(item_code))
+			overage = flt(qty) - min_order_qty
+			if min_order_qty and flt(overage, precision) > 0 and overage < itemwise_step[item_code]:
+				frappe.toast(
+					_(
+						"Item {0}: Ordered qty {1} {2} exceeds the minimum order qty {3} {2} by {4} {2} due to purchase UOM rounding."
+					).format(
+						item_code,
+						flt(qty, precision),
+						itemwise_stock_uom[item_code],
+						min_order_qty,
+						flt(overage, precision),
+					),
+					indicator="orange",
+				)
+
 	def get_schedule_dates(self):
 		for d in self.get("items"):
 			if d.material_request_item and not d.schedule_date: