title: Invalid ARN exception when creating object with Cloud Directory
body: <p>I am trying to enter a new object in a AWS CloudDirectory using the organization schema that comes by default.</p>
  
  <pre><code>import boto3
  #
  client = boto3.client('clouddirectory')
  #
  AWS_CLOUD_DIR_ARN = 'arn:aws:clouddirectory:us-east-1:000000000000:directory/AUaGFp4A7Ea_lY5QwPxSQTw'
  AWS_CLOUD_DIR_SCHEMA_ARN = 'arn:aws:clouddirectory:us-east-1:000000000000:schema/published/customer-org.json/v0.0'
  #
  schemaFacets = [
      {
          "SchemaArn" : AWS_CLOUD_DIR_SCHEMA_ARN,
          "FacetName" : "Organization"
      },
      {
          "SchemaArn" : AWS_CLOUD_DIR_SCHEMA_ARN,
          "FacetName" : "Legal_Entity"
      }    
  ]
  objectAttributeList = [
      {
        "Key" : {
          "SchemaArn" : AWS_CLOUD_DIR_SCHEMA_ARN,
          "FacetName" : "Organization",
          "Name" : "account_id"
        },
        "Value" : {
          "StringValue" : "W000"
        }
      },
  </code></pre>
  
  <p>The <code>schemaFacets</code> list has number of other fields that make up the schema. And finally,</p>
  
  <pre><code>response = client.create_object(
      DirectoryArn = AWS_CLOUD_DIR_ARN,
      SchemaFacets = schemaFacets,
      ObjectAttributeList = objectAttributeList
  )
  print response 
  </code></pre>
  
  <p>I get a response as:</p>
  
  <pre><code>botocore.errorfactory.InvalidArnException: An error occurred (InvalidArnException) when calling the CreateObject operation: Provided ARN is invalid arn:aws:clouddirectory:us-east-1:000000000000:schema/published/customer-org.json/v0.0
  </code></pre>
  
  <p>Whereas, both the directory and schema ARN do in fact exist. What am I missing?</p>