Help with perform statement

[Former Member]

Hi all,

I have this perform statement

data: gt_outtab type table of mara,

gt_fieldcat type lvc_t_fcat.

perform create_and_init_alv changing gt_outtab

gt_fieldcat.

when i double click on this perform ian getting a form like this

FORM create_and_init_alv CHANGING P_GT_OUTTAB

P_GT_FIELDCAT.

ENDFORM. " create_and_init_alv

when i look at the sap standard program for the same perform statement

it has something like this

perform create_and_init_alv changing gt_outtab

gt_fieldcat.

form create_and_init_alv changing pt_outtab like gt_outtab[]

pt_fieldcat type lvc_t_fcat.

ENDFORM.

my questions are

1)can anyone tell me why there is a difference

2) do we need to writ things again in form like gt_outtab[] and type lvc_t_fcat as you see in sap standard code.

what is the purpose of it.

Thanks

Kajol

[amit_khare]

Its not necessaru to have those values if the data declarations are global.But this will give error in Extended Check (SLIN).

We need to mention these things manually.Its a good practice.

Regards,

Amit

Reward all helpful replies.

[Former Member]

Hi,

Thats the only reason. When you say Global Declarations , i have declared at the top of tthe program and thats it means its global for entire program

Thanks

[marcelo_ramos]

Hi,

When you create a form by double click the system generate the declaration source of the form like this -> perform create_and_init_alv changing <b>gt_outtab</b>

<b>gt_fieldcat</b>.

I recommend you to insert the statments like <reference>, beyond the reason previously informed exists the other problem, the performance. If you don't inform the reference, the time of program's processing are bigger.

Regards.

Marcelo Ramos.

[Former Member]

Thanks all.

I have assigned points to all