<p>Allows you to request changes for your entities. Within a single <code>ChangeSet</code>, you can't start the same change type against the same entity multiple times. Additionally, when a <code>ChangeSet</code> is running, all the entities targeted by the different changes are locked until the change set has completed (either succeeded, cancelled, or failed). If you try to start a change set containing a change against an entity that is already locked, you will receive a <code>ResourceInUseException</code> error.</p> <p>For example, you can't start the <code>ChangeSet</code> described in the <a href="https://docs.aws.amazon.com/marketplace-catalog/latest/api-reference/API_StartChangeSet.html#API_StartChangeSet_Examples">example</a> later in this topic because it contains two changes to run the same change type (<code>AddRevisions</code>) against the same entity (<code>entity-id@1</code>).</p> <p>For more information about working with change sets, see <a href="https://docs.aws.amazon.com/marketplace-catalog/latest/api-reference/welcome.html#working-with-change-sets"> Working with change sets</a>. For information on change types for single-AMI products, see <a href="https://docs.aws.amazon.com/marketplace-catalog/latest/api-reference/ami-products.html#working-with-single-AMI-products">Working with single-AMI products</a>. Als, for more information on change types available for container-based products, see <a href="https://docs.aws.amazon.com/marketplace-catalog/latest/api-reference/container-products.html#working-with-container-products">Working with container products</a>.</p>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}