topic Re: SORT question in Application Development and Automation Discussions

SORT question

Former Member — Thu, 31 Jul 2008 07:25:49 GMT

Hi,

I have the following code:

*SORT GT_ITAB BY name1 ASCENDING.
BREAK-POINT.
LOOP AT gt_itab INTO wa.
*  READ TABLE gt_itab INDEX sy-index INTO lv_wa TRANSPORTING name1.
  lv_wa = wa-name1.
  IF lv_cust <> lv_wa.
    APPEND lv_cust TO lv_new_itab.
    lv_cust = lv_wa.
  ENDIF.
ENDLOOP.

SORT lv_new_itab BY name1 ASCENDING.

Why is it so that if I uncomment the 1st line the program check isn't successful - giving me the following message: "You may only read from table "GT_ITAB" . reading. reading. reading. reading. reading."

but if I leave it like this (commented) the check goes ok ? Since the last SORT is being accepted it seems that you can't touch on the data after a SORT ? The 2nd sort, nevertheless, doesn't seem to be working anyway.

What's happening ?

Thanks

Avraham

Re: SORT question

Former Member — Thu, 31 Jul 2008 07:27:51 GMT

hi,

Try this.

Use sy-tabix instead of sy-index.

For syntax of READ, check

http://help.sap.com/saphelp_nw70/helpdata/en/fc/eb35f8358411d1829f0000e829fbfe/content.htm

Regards,

Anirban

Re: SORT question

matt — Thu, 31 Jul 2008 07:28:06 GMT

Because GT_ITAB is protected in some way - perhaps an importing parameter to a method, for example. The rest of the program makes no sense, lv_cust never has a value assigned, so I'm not surprised that the 2nd sort "doesn't seem to be working", though you don't specify what you mean by "doesn't seem to be working".

matt

Re: SORT question

Former Member — Thu, 31 Jul 2008 07:29:39 GMT

Hi,

SY-INDEX doesnt work for Internal table loops, but only for conditional loops. Try using SY-TABIX for the INDEX in your READ statement

Re: SORT question

Former Member — Thu, 31 Jul 2008 07:31:28 GMT

The READ statement is commented, guys, sorry, I should have taken it off the excerpt.

Matthew, maybe you have a point - because indeed my table is an imported parameter - this piece of code is within a Form.

Re: SORT question

matt — Thu, 31 Jul 2008 07:31:59 GMT

For those of you wittering on about sy-index - please READ THE QUESTION.

Re: SORT question

Former Member — Thu, 31 Jul 2008 07:32:45 GMT

Re: SORT question

Former Member — Thu, 31 Jul 2008 07:36:27 GMT

Matt, lv_cust does have a value assigned, it is defined under the Global definitions in the Form. It starts with ''. The debugging shows (and actually the form preview) the values are being assigned.

I have to delve into your hint about "protected in some way".

Re: SORT question

matt — Thu, 31 Jul 2008 07:39:24 GMT

OK. Sometimes it's difficult to get the balance between posting too much code, and posting too little!

Note, that it may not just be the form. If the form is called from a function module that's called from a method that has the table as an importing parameter, you'll get the same problem.

Re: SORT question

Shafiq_Rehman1 — Thu, 31 Jul 2008 07:42:08 GMT

You need to check "Pass by Value" in Form Interface Parameter

Re: SORT question

Former Member — Thu, 31 Jul 2008 08:00:43 GMT

Thanks Shafiq, good catch.

The check doesn't complain now.