Policy:
    Type: AWS::SQS::QueuePolicy
    Metadata:
      Comment: "cross accout policy"
      Test: "yes"
      Bla: "Bla"
    Properties:
      PolicyDocument:
        Id: aaa
        Version: "2012-10-17"
        Statement:
          - Sid: aaa
            Effect: Allow
            Action:
              - sqs:SendMessage
            Principal:
              AWS:
                - !Sub "${AWS::AccountId}"
            Resource: !GetAtt Queue.Arn
      Queues:
        - !Ref Queue