Yes i agree with you gerd.
But one thing to notice (it's not always obvious ... because in JDE documentation, you never find anything about adding a data server) :
In the data sources, you specify the Database name (connection string for oracle e.g.) and the "Server Name" which is the name of your enterprise server, not the name of your data server !
Indeed, you never use (except in the add server plan) the name of the data server. JDE just "knows" the enterprise server (where jde services are running).
Cheers,
Antoine.
OW system admin.