How to execute Report given the results of a previously executed Report in ABAP - submit

Question

My problem is the following:
I have one report called Y5000112.
My colleagues always execute it manually once with selection screen variant V1 and then execute it a second time with variant V2 adding the results of the first execution to the selection.
Those results in this case are PERNR.
My goal:
Automate this - execute that query twice with one click and automatically fill the PERNR selection of the second execution with the PERNR results of the first execution.
I found out how to trigger a report execution and after that another one, how to set it to a certain variant and got this far - [EDIT] after the first answer I got a bit further but I still have no idea how to loop through my results and put them into the next Report submit:
DATA: t_list TYPE TABLE OF abaplist.
* lt_seltab TYPE TABLE OF rsparams,
* ls_selline LIKE LINE OF lt_seltab.
SUBMIT Y5000114
USING SELECTION-SET 'MA OPLAN TEST'
EXPORTING LIST TO MEMORY
AND RETURN.
CALL FUNCTION 'LIST_FROM_MEMORY'
TABLES
listobject = t_list
EXCEPTIONS
not_found = 1
OTHERS = 2.
IF sy-subrc <> 0.
WRITE 'Unable to get list from memory'.
ELSE.
* I want to fill ls_seltab here with all pernr (table pa0020) but I haven't got a clue how to do this
* LOOP AT t_list.
* WRITE /t_list.
* ENDLOOP.
SUBMIT Y5000114
* WITH-SELECTION-TABLE ls_seltab
USING SELECTION-SET 'MA OPLAN TEST2'
AND RETURN.
ENDIF.
P.S.
I'm not very familiar with ABAP so if I didn't provide enough Information just let me know in the comments and I'll try to find out whatever you need to know in order to solve this.
Here's my imaginary JS-Code that can express very generally what I'm trying to accomplish.
function submitAndReturnExport(Reportname,VariantName,OptionalPernrSelection)
{...return resultObject;}
var t_list = submitAndReturnExport("Y5000114","MA OPLAN TEST");
var pernrArr = [];
for (var i in t_list)
{
pernrArr.push(t_list[i]["pernr"]);
}
submitAndReturnExport("Y5000114","MA OPLAN TEST2",pernrArr);

Answer 1

It's not that easy as it supposed to, so there won't be any one-line snippet. There is no standard way of getting results from report. Try EXPORTING LIST TO MEMORY clause, but consider that the report may need to be adapted:
SUBMIT [report_name]
WITH SELECTION-TABLE [rspar_tab]
EXPORTING LIST TO MEMORY
AND RETURN.
The result of the above statement should be read from memory and adapted for output:
call function 'LIST_FROM_MEMORY'
TABLES
listobject = t_list
EXCEPTIONS
not_found = 1
others = 2.
if sy-subrc <> 0.
message 'Unable to get list from memory' type 'E'.
endif.
call function 'WRITE_LIST'
TABLES
listobject = t_list
EXCEPTIONS
EMPTY_LIST = 1
OTHERS = 2
.
if sy-subrc <> 0.
message 'Unable to write list' type 'E'.
endif.
Another (and more efficient approach, IMHO) is to gain access to resulting grid via class cl_salv_bs_runtime_info. See the example here
P.S. Executing the same report with different parameters which are mutually-dependent (output pars of 1st iteration = input pars for the 2nd) is definitely a bad design, and those manipulations should be done internally. As for me one'd better rethink the whole architecture of the report.