Update deploy-s4hana.md

Author: jahjha

articles/center-sap-solutions/deploy-s4hana.md

@@ -20,7 +20,7 @@ In this how-to guide, you'll learn how to deploy S/4HANA infrastructure in *Azur
 - An Azure subscription.
 - Register the **Microsoft.Workloads** Resource Provider on the subscription in which you are deploying the SAP system.
 - An Azure account with **Contributor** role access to the subscriptions and resource groups in which you'll create the Virtual Instance for SAP solutions (VIS) resource.
-- A **User-assigned managed identity** which has Contributor role access to the resource groups of the SAP system. 
+- A **User-assigned managed identity** which has Contributor role access on the Subscription or atleast all resource groups (Compute, Network,Storage). If you wish to install SAP Software through the Azure Center for SAP solutions, also provide Storage Blob data Reader, Reader and Data Access roles to the identity on SAP bits storage account where you would store the SAP Media.
 - A [network set up for your infrastructure deployment](prepare-network.md).
 
 ## Deployment types