When you invoke a remote service, all the inputs from the current pipeline will be sent… Drop variables/docs that are not required… In case if you think, pipeline data cannot be reduced bcoz of successive actions, use the Scope option that will restrict to set of inputs being sent…
The output (all pipeline data) of the remote service will be sent back to the caller as response… See Built in services guide for more reference…
HTH
Senthil
#Flow-and-Java-services#webMethods#Integration-Server-and-ESB