Debugging with several RFC hops

I have a central application on system B, which is called from system A. The application needs in addition some special data again from A, so there is an RFC jump back to A ti get the required data,
In short: A calls B, B calls A back to get some data. I' able to set a breakpoint in B, and system stops. After that i'm unable to step into the rfc funcion call back to A, it always executs the FM in one step. Setting a breakpoint in A reveals the Message "Debugging not possible".
Am i doing something wrong or is there really a limit regarding the RFC hops? In this case, one RFC is working, but the second back to A doesnt stop at the breakpoint.
Any idea?

hi ruber
good question
try out like this
core code modification required.
in the standard program
SAPMSSY1(subroutine pool)
In the form you need to insert a code like this.
FORM REMOTE_FUNCTION_CALL USING VALUE(TYPE).
DO.
    CALL 'RfcImport' ID 'Type' FIELD TYPE.
***inserted
    perform check_for_debug in program XXXXXXXXXXXX.
***inserted
    PERFORM (SY-XFORM) IN PROGRAM (SY-XPROG).
    RSYN >SCONT SYSC 00011111 0.
ENDDO.
ENDFORM.
and the XXXXXXXXXX program is in turn a subroutine pool
form check_for_debug.
TABLES: *******.
SY-SUBRC = 0.
WHILE SY-SUBRC = 0.
    SELECT SINGLE *
           FROM ******
           WHERE UNAME = SY-UNAME
             AND FNAME = SY-XFORM.
    if sy-subrc = 0.
      do 1000 times.
      enddo.
    endif.
ENDWHILE.
endform.
And in the z table you can create a 2 fields for which you can maintain table maintenance generator and in that you can add your RFC user.
and in these both systems this is should be maintained
and for this a heavy effort was put up by me
is it ok 4 you
try out
all the best

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