Merge pull request #205394 from bandersmsft/ghissue95934

MCM - Minor udpate for ghissue 95934

Author: PRMerger6

articles/cost-management-billing/manage/ea-portal-enrollment-invoices.md

@@ -3,7 +3,7 @@ title: Azure Enterprise enrollment invoices
 description: This article explains how to manage and act on your Azure Enterprise invoice.
 author: bandersmsft
 ms.author: banders
-ms.date: 05/31/2022
+ms.date: 07/20/2022
 ms.topic: conceptual
 ms.service: cost-management-billing
 ms.subservice: enterprise
@@ -97,6 +97,8 @@ The Azure Enterprise portal automatically generates a default purchase order (PO
 
 To prevent automatic generation of PO numbers every month, you can lock the PO number. See [Lock PO number](#lock-po-number-to-prevent-automatic-update-in-upcoming-billing-cycles).
 
+To update the PO number, the **Lock PO number** must not be selected. 
+
 ### Update the Azure services purchase order number
 
 1. From the Azure Enterprise portal, select **Report** > **Usage Summary**.