Solution Use the function module /guixt/submitreport.

Example 1
We read plant maintenance orders, using the standard ABAP report RIAUFK20 which implements transaction IW39:

 

At the right hand side of the above picture  you see the "System->Status" popup which shows the underlying program RIAUFK20, here in an S/4HANA system.

Alternatively you may use transaction SE93 to display the transaction type and the underlying ABAP program:

There are two ways to pass the selection parameters to /guixt/submitreport:

(a) Define a selection variant and pass the name of the variant
(b) Pass a table containing all individual selection parameters

In this example we assume that there is a selection variant "OPENORDERS" defined in IW39 which we want to use:

The selection variant OPENORDERS also defines the layout of the resulting grid control:

The "Displayed columns" are precisely the columns that are returned by /guixt/submitreport.

InputScript  

// read PM orders via RIAUFK20 and variant OPENORDERS
Call "/guixt/submitreport" _
  in.progname="RIAUFK20" _
  in.variant="OPENORDERS" _
  table.csvdata="pmorders"

// copy grid data into CSV file
CopyText fromText="pmorders" toFile="C:\temp\pmorders.csv" -utf8

// display the file (Excel)
Start "C:\temp\pmorders.csv"

Result
Excel opens up and displays the selected PM orders: 

Example 2
We display sales figures for material numbers entered by the user:

The material texts are read from the database (table MAKT) and the sales figures via the sales information system:

The underlying transaction is MCTC and the ABAP report is RMCV0200:

GuiXT Script  

// create structured variables
if not V[matorders]
  CreateStructure V[matinfo] matnr maktx orders sales quantity
  CreateTable V[matorders] include=V[matinfo]
endif

// list of selectable years
Set V[year0] "&V[today_y]"
Set V[year1] &V[year0] - 1
Set V[year2] &V[year0] - 2

Set text[list_of_years] "&V[year0];&V[year1];&V[year2]"

// default: current year
if not V[selected_year]
  Set V[selected_year] "&V[year0]"
endif

// year selection
Text (1,10) "Select year" -label
DropDownList (1,20) "list_of_years" width=10 refer="V[selected_year]" -noSort

// button to read statistics data
Pushbutton (1,36) "Read sales data" size=(1,24) process="read_sales_data.txt"

// table to enter material numbers and display the sales figures
Table (3,10) (15,118) title="Material orders in &V[selected_year]" _
   name="matorders" fixedColumns=5
 Column "Material" size=16 name="matnr" searchHelp="MAT1"
 Column "Text" -readOnly size=40 name="maktx"
 Column "Incoming orders" -readOnly size=16 name="orders"
 Column "Sales volume" size=16 name="sales" -readOnly
 Column "Billing Qty" size=16 name="quantity" -readOnly

InputScript
 
// ---------------------------------------
// Read sales data via SAP report RMCV0200
// ---------------------------------------

Set V[k] 0

// table for report selection parameters
CreateStructure V[rsparams] selname kind sign option low high
CreateTable V[myparams] include=V[rsparams]

// process all table rows
label next_row

if V[k<&V[matorders.rowcount]]

  Set V[k] &V[k] + 1
 
  // read table row Nr. k
   ReadRow V[matinfo] table=V[matorders] index=&V[k]

  // material number specified?
   if V[matinfo.matnr]

  // read material text and also return matnr in internal format
  // we use the cache so that each material is read only once if
  // the user presses the "Read" button again

  Call text[r]

  Call /guixt/dbselect cache="transaction" _
   in.table="MAKT" _
   in.fields="MAKTX,*MATNR" _
   in.condition="SPRAS = '&V[_language]' and MATNR = @MATNR" _
   in.domname1="MATNR" _
   in.domvalue1="&V[matinfo.matnr]" _
   table.values="r"

  // material text and matnr in internal format
  CopyText fromText="r" toString="maktx" line=1
  CopyText fromText="r" toString="intmatnr" line=2

 // set material text
  Set V[matinfo.maktx] "&V[maktx]"

  // material not found?
  if not V[maktx]

     // clear existing text
    UpdateRow V[matinfo] table=V[matorders] index=&V[k]

    // set cursor to wrong material number
     if V[k<&V[matorders.stat.firstvisiblerow]] or _
      V[k>&V[matorders.stat.lastvisiblerow]]

         // scrolling is necessary
        Set V[matorders.stat.firstvisiblerow] &V[k]
        SetCursor cell[matorders,matnr,1]

     else

      // no scrolling is necessary
      Set V[relposrow] &V[k] - &V[matorders.stat.firstvisiblerow]
      Set V[relposrow] &V[relposrow] + 1
      SetCursor cell[matorders,matnr,&V[relposrow]]

    endif

     // display error message
      Message "E: Material &V[matinfo.matnr] not found" -statusline

    // teminate processing
     return

  endif

    // append material number
  Set V[rsparams.selname] "SL_MATNR"
  Set V[rsparams.kind] "S"
  Set V[rsparams.sign] "I"
  Set V[rsparams.option] "EQ"
  Set V[rsparams.low] "&V[intmatnr]"
  AppendRow V[rsparams] table=V[myparams]

 else

   Clear V[matinfo]

 endif

 // update the row, i.e. set the material text
 UpdateRow V[matinfo] table=V[matorders] index=&V[k]

 goto next_row

// set sales organization selection
Set V[rsparams.selname] "SL_VKORG"
Set V[rsparams.kind] "S"
Set V[rsparams.sign] "I"
Set V[rsparams.option] "EQ"
Set V[rsparams.low] "1010"
AppendRow V[rsparams] table=V[myparams]

// set period selection
Set V[rsparams.selname] "SL_SPBUP"
Set V[rsparams.kind] "S"
Set V[rsparams.sign] "I"
Set V[rsparams.option] "BT"
Set V[rsparams.low] "&V[selected_year]01"
Set V[rsparams.high] "&V[selected_year]12"
AppendRow V[rsparams] table=V[myparams]

// Start report RMCV0200 for the entered material numbers
Set V[progname] "RMCV0200"

// csvdata has only one component ("feld")
CreateTable V[csvdata] feld

// submit report
Call "/guixt/submitreport" _
  export.progname="progname" _
  export.params="myparams" _
  import.csvdata="csvdata"

// we transform the CSV format into GuiXT structured table
CreateStructure V[mysalesinfo] matnr orders sales openquantity quantity
CreateTable V[mysales] include=V[mysalesinfo]

CopyText fromTable=V[csvdata] toText="temp"
CopyText fromText="temp" toTable=V[mysales] delimiter=";"

// finally we merge the sales values into our table
Set V[k] 0

label merge_sales

if V[k<&V[matorders.rowcount]]
  Set V[k] &V[k] + 1

  // read table row
  ReadRow V[matinfo] table=V[matorders] index=&V[k]

  // material number specified?
  if V[matinfo.matnr]

   // table lookup in the sales figure table
     ReadRow V[mysalesinfo] table=V[mysales] key="&V[matinfo.matnr]"
     if q[ok]
        Set V[matinfo.orders] "&V[mysalesinfo.orders]"
        Set V[matinfo.sales] "&V[mysalesinfo.sales]"
     Set V[matinfo.quantity] "&V[mysalesinfo.quantity]"
     else
       Clear V[matinfo.orders]
     Clear V[matinfo.sales]
     Clear V[matinfo.quantity]
   endif

   // update table row (sales figures)
    UpdateRow V[matinfo] table=V[matorders] index=&V[k]

  endif

  // next row
  goto merge_sales

Components InputAssistant