Power BI Rest API - Update All Connections?

Hi, 

I'm using the API of "Update All Connections" to update one dataset's data source in Power BI's portal. This dataset is using direct query from a Azure SQL database. When I updated it to another Azure SQL DB, the dashboard failed.... So I want to know the limitation of this API. What kind of features should the both Azure SQL DB have, like same table name, same table schema, same database name?

Thanks,

Shijun