diff --git a/src/API/BillingItems/BillingItemEntity.php b/src/API/BillingItems/BillingItemEntity.php
index efb638cc..c2104870 100644
--- a/src/API/BillingItems/BillingItemEntity.php
+++ b/src/API/BillingItems/BillingItemEntity.php
@@ -58,6 +58,12 @@ class BillingItemEntity extends DataTransferObject
     public ?Carbon $webServiceDate;
     /** @var \Anteris\Autotask\Support\UserDefinedFields\UserDefinedFieldEntity[]|null */
     public ?array $userDefinedFields;
+    public ?int $contractServiceID;
+    public ?int $contractServiceBundleID;
+    public ?int $contractServiceAdjustmentID;
+    public ?int $contractServiceBundleAdjustmentID;
+    public ?int $contractServiceBundlePeriodID;
+    public ?int $contractServicePeriodID;
 
     /**
      * Creates a new BillingItem entity.