Output variables between services ${state}

Serverless Framework
1

Hi,

I’ ve two services database-backend and api-backend

In the service database-backend I would like to output the database Arn so I can use it in the api-backend service in iamrole section.

In the api-backend service I would like to get the output from database-backend service using ```
${state:my-service.var-key}


But In the  database-backend I cannot output the dynamoDb table ARN

In database-backend : this is working fine
outputs:
  database_events_table_name: ${self:custom.events-table-name}   

In database-backend : this is not working 
outputs:
  database_events_table_name1: !Ref DynamoEventTable  
  database_events_table_name2: !GetAtt [ DynamoEventTable, Arn ]

Not working
output:
database_events_table_name_arn:
         Value: !GetAtt [ DynamoEventTable, Arn ]
    Value: !GetAtt [ DynamoEventTable, Arn ]

Thanks for your help