About at new statement with offset/length

Question

Hi All,
I have following source code:
data:
  begin of tab occurs 3,
          fcode(4) type c,
      end of tab.
append 'aaaa' to tab.
append 'babb' to tab.
append 'abaa' to tab.
append 'cdef' to tab.
data:
  lv_test(4) type c.
loop at tab.
  at new fcode+1(1).
  move tab-fcode+1(1) to lv_test.
  write / lv_test.
  endat.
ENDLOOP.
The excution result is:
a
a
b
d
My question is:  why the offset/length of 'fcode+1(1)' doesn't work at all.
Any help is appreciated!

Answer 1

AT for group change
Change of group when processing loops of extracts and internal tables.
Syntax
AT NEW <f>.
AT END OF <f>.
AT FIRST.
AT LAST.
AT <fg>.
The statements are used to process group levels within a loop using an extract dataset or an internal table. They introduce statement blocks that must be closed with ENDAT. The statements between AT and ENDAT are only executed if the corresponding group change occurred.
When ever you use the control events and display the data you get some scrapped values.
So, to avoid it use <b>READ TABLE <table name> INTO <WA></b>. and then print the values.
Regards,
Pavan P.