Convert the property policyId of type ResourceIdentifier to type String in ProtectedItem.

sdk/recoveryservices-backup/Azure.ResourceManager.RecoveryServicesBackup/CHANGELOG.md

@@ -11,6 +11,8 @@
 
 ### Bugs Fixed
 
+Convert the property policyId of type ResourceIdentifier to type String in ProtectedItem. Issue at https://github.com/Azure/azure-sdk-for-net/issues/47381
+
 ### Other Changes
 
 ## 1.2.0 (2024-01-03)

sdk/recoveryservices-backup/Azure.ResourceManager.RecoveryServicesBackup/src/Custom/Models/BackupGenericProtectedItem.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 using System.ComponentModel;
+using Azure.Core;
 
 namespace Azure.ResourceManager.RecoveryServicesBackup.Models
 {
@@ -20,5 +21,13 @@ public int? SoftDeleteRetentionPeriod
                 SoftDeleteRetentionPeriodInDays = value;
             }
         }
+
+        /// <summary> ID of the backup policy with which this item is backed up. </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        public ResourceIdentifier PolicyId
+        {
+            get => string.IsNullOrEmpty(PolicyStringId) ? null : new ResourceIdentifier(PolicyId);
+            set => PolicyId = new ResourceIdentifier(PolicyStringId);
+        }
     }
 }