ARTICLE
RFC Dialog Interactions
In an RFM called using RFC, both the
variants sRFC and
aRFC can execute dialog interactions using SAP GUI or call
screens. This is not possible with the variants
bgRFC , tRFC , and
qRFC . It is technically possible for
pRFC but not recommended.
Dialog interfactions executed by sRFC and aRFC require the
RFC client to be executed in the foreground in a dialog work process and
that the user defined in the destination has dialog authorization.
RFM does not open a SAP GUI window on the RFC server; instead it does
the following:
sRFC uses the current SAP GUI window of the caller, which means
that the current screen is replaced temporarily by the screen of the rem
otely called function. Entering /ntcode commands in the command
field of the standard toolbar closes
the remote connection and the calling program continues its processing
after the RFC. The behavior on the server side is then no longer
defined.
aRFC opens a new external session in the RFC client and displays
the remotely executed application in a new SAP GUI window there. Enteri
ng /ntcode commands in the command field of the standard toolbar
executes the transaction "tcode" in this session.
The screen data is passed back by the RFC interface to the calling
system. Statements for classic list output, such as WRITE , which
are executed when a function module is called remotely, write to the
list buffer of the RFC server. The statement LEAVE TO
LIST-PROCESSING can be used to display the lists during a screen
sequence displayed in a SAP GUI window of the caller. List outputs made
in programs called from RFM are also displayed in a SAP GUI
window of the caller.
In both cases, entering /otcode commands in the command field of
the standard toolbar opens another external session on the RFC server
and an additional external session for displaying a SAP GUI window on
the client side. This happens when the transaction "tcode" is
executed.
Note
If RFM s are called externally by dialog interactions, you must
make sure that only dialog windows (that is, SAP GUI windows without a
standard toolbar) are displayed, and that no commands can therefore be
entered in the command field.
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved