topic Re: At first - Work area initialized in Application Development and Automation Discussions

At first - Work area initialized

Former Member — Wed, 11 Feb 2009 10:34:59 GMT

Hi,

I am quite new to ABAP. Forgive me if this is really a stupid question. But I tried to search and could not find any solution for the same. So here is the problem.

I have an inner loop and I want to use the At first statement here. My code is some thing like

loop at itab_1 into wa_1.

loop at itab_2 into wa_2 where matnr = wa_1-matnr.

at first.

wa_1-netpr = wa_2-netpr

modify itab_1 from wa_1.

continue.

endat.

wa_1-lifnr = wa_2-lifnr.

append wa_1 to itab_3.

endloop.

The problem is the work area wa_2 values are initialized when the control gets into at first. Why does this happen? Is this the expected behaviour? If so, how can I modify my code to achieve the same result?

Thanks

Jai

Re: At first - Work area initialized

Former Member — Wed, 11 Feb 2009 10:40:54 GMT

loop at itab_1 into wa_1.
*  loop at itab_2 into wa_2 where matnr = wa_1-matnr.
  loop at itab_2 where matnr = wa_1-matnr.
    wa_2 = itab2.
    at first.
       wa_1-netpr = wa_2-netpr
       modify itab_1 from wa_1.
        continue.
    endat.
    wa_1-lifnr = wa_2-lifnr.
    append wa_1 to itab_3.
  endloop.
endloop.

U shouldn't use AT FIRST event in a LOOP with the WHERE condition.

Max

Re: At first - Work area initialized

Former Member — Wed, 11 Feb 2009 10:41:28 GMT

this problems happens somethimes..i dont know why...

define wa_temp type wa_2

do this:

loop at itab_1 into wa_1.

loop at itab_2 into wa_2 where matnr = wa_1-matnr.

wa_temp = wa_2.

'then use wa_temp'

at first.

wa_1-netpr = wa_temp-netpr

modify itab_1 from wa_1.

continue.

endat.

wa_1-lifnr = wa_temp-lifnr.

append wa_1 to itab_3.

endloop.

Re: At first - Work area initialized

Former Member — Wed, 11 Feb 2009 10:41:54 GMT

Hi,

The main pre-requisite to use AT FIRST stmt is to sort the internal table before the looping....

Ex:

Changes made in u code:

sort itan by netpr.

loop at itab_1 into wa_1.

loop at itab_2 into wa_2 where matnr = wa_1-matnr.

at first.

wa_1-netpr = wa_2-netpr

modify itab_1 from wa_1.

continue.

endat.

wa_1-lifnr = wa_2-lifnr.

append wa_1 to itab_3.

endloop.

AT FIRST means prints whatever the data in this, at the beging of the loop before displaying the data or populationg the data.Generaly we u use this stmt to print the headers means labels of that table.....

Regards

Kiran

Re: At first - Work area initialized

Former Member — Wed, 11 Feb 2009 10:46:52 GMT

hi,

In your code, the used AT FIRST will be executed only for the first loop pass, hence use At New <field-name>.

This block is executed for every new value of <field-name>.

Thanks and regards

Sharath