Subroutines issue with fields

[Former Member]

I have a subroutine

and in the form statement

FORM SUB_xxx using gt_itab.

SORT GT_Itab BY LIFNR zzvalid.

DELETE ADJACENT DUPLICATES FROM GT_Itab COMPARING LIFNR ZZVALID.

-

---

endform.

Here the system throws a message that lifnr, zzvalid fields could not be identified.

Can any one please help me why i am getting issue with sort, delete adjacent duplicates.

I am able to do my program for this itab after i comment out these two...

[Former Member]

HI Narendra,

U need to provide the structure for gt_itab.

Perform SUB_XXX tables itab.

FORM SUB_xxx <b>Tables gt_itab structure itab</b>.

SORT GT_Itab BY LIFNR zzvalid.

DELETE ADJACENT DUPLICATES FROM GT_Itab COMPARING LIFNR ZZVALID.

-

---

endform.

Regards

SAB

[Former Member]

You need to speficy the structure of the Internal table in your FORM...

FORM GET_TABLE TABLES T_MYTAB
                              STRUCTURE TY_MYTAB.
*Do some logic here....
ENDFORM. 

Greetings,

Blag.

[Former Member]

HI Narendra,

U need to provide the structure for gt_itab.

Perform SUB_XXX tables itab.

FORM SUB_xxx <b>Tables gt_itab structure itab</b>.

SORT GT_Itab BY LIFNR zzvalid.

DELETE ADJACENT DUPLICATES FROM GT_Itab COMPARING LIFNR ZZVALID.

-

---

endform.

Regards

SAB

[Former Member]

Hi

What you are writing in the PERFORM statement

Write

PERFORM SUB_XXX tables ITAB then

FORm SUB_XXX table gt_itab.

<try now to delete>

endform.

But just to delete after sort why do you need a perform and form.

you can straight away do it without subroutine.

Reward points if useful

Regards

Anji

[Former Member]

I tried with the way you have asked me to do so..

It diesnt recognize the work area.

I need to sort the internal table to do some calculations. This is very important for me.

Please let me know how i can accomplish this