Single RFC Lookup should return multiple values - but returns no values

Question

I have an RFC Lookup in my PID system that i had to change due to a test defect.
the FM i wrote was working on a single value and returning the correct entry...  however it now needs to return multliple entries and map 0..unbounded....
i have made the changes, the FM works in ECD, however when i call the FM from the mapping, it does not return any values...  now, i am asking my basis team to change the PIAPPLUSER to dialog user so i can throw a breakpoint for an external user... 
has anyone done a single to multi value mapping on lookup?  i am not sure that it is the FM that is incorrect as it is very simple code..   
DATA: lt_jobtype TYPE zhr_lkupjobtype_t.
  CLEAR     lt_jobtype.
  REFRESH lt_jobtype.
  SELECT * FROM zhr_lkupjobtype
    INTO TABLE lt_jobtype
    WHERE zinterface_id = import-zinterface_id
    AND   zsap_jobtype  = import-zsap_jobtype.
  MOVE lt_jobtype TO export.
is there a way of checking the RFC part of an message mapping?  i checked the full trace within graphical mapping but this shows no return....

Answer 1

I am using a MOVE instead of APPEND.
according to the keyword help if the tables are identical, you can use MOVE.
it works when i test in SE37.
i have tested it both ways and i get the same result each time.
i even tried it this way:
  SELECT * FROM zhr_lkupjobtype
    INTO TABLE export 
    WHERE zinterface_id = import-zinterface_id
    AND   zsap_jobtype  = import-zsap_jobtype.
and that works too to get the target values into the export table!  that's what made me think it was not the code as i have tried three different ways of writing the same code...  the Function Module works perfectly anyway!  but when it is called from PI i cannot see if any values are returned....