User Details In RFC Type T Conn. for IDOC_AAE Sender

Hi All,

There is one doubt related to flow of IDOC in single stack .

We are using IDOC_AAE sender channel in Default mode , following are the configuration done :

In ECC :

RFC Destination Type T with Program ID and Gateway host and Service , here host annd service are of PO .

In NWA :

Resource adapter : inboundRA : here default destination name was maintained and the Same Program ID , Destination maintained here is of ECC .

My Question is :

Here we are not maintaining User details of PO server  any where not even in RFC destination Type T and neither in the Resource adapter but our data is flowing from our Application Server(ECC) to Integration Server(PO) , So where is the authentication done of the data flow between two server .

As per my understanding the while communication between two server the authentication is must .

Thanks