The user programs USR6304N and USR6305N are only used to set the “mode” of Reliable RPC (auto-commit vs. client-commit) and to do the commit/rollback in case of client-commit. p-message is an output parameter and contains the error text (in case the return code is not 0).
The application message itself is sent with a standard callnat.
#EntireX#Mainframe-Integration#webMethods