Dataflow having data source from more than one Gateway

I am trying to build a dataflow which is using data from more than one gateway but when I add new data from seperate gateway the previous data source connections gets overwritten and it asks me to reconfigure it. I am unable to get data from multiple gateways and it is not possible to get all the data from a single gateway. Is it a limitation on powerbi or is there something else which I am missing. I also tried to add credentials through the manage connections tab but still it is failing.