system fields

[Former Member]

Can we change system field values? Please give explanation on the basis of sy-lsind.?

[Former Member]

no u can not chnage the system field values but wht u can do is u can store them in some variabgle on some condition and then do processing based on tht variable..

otherwsie u can not change the sy values at runtime..

reward if helpfull

[Former Member]

Yes, few times the requirement makes us to change the system values that are populated fields at run-time.

Also note that some of these fields will be re-determined for each step execution.

<b>SY-LSIND</b> - This variable is for List Index.

Will be used in Interactive lists.

Consider an example where we have generated one basic list and 3 secondary lists.

So the users requirement is to get back to the selection screen when he/she uses the BACK(F3).

In this case, we can acheive by changing the list index.

SY-LSIND = 0.

Hope the info gives you some idea.

Kind Regards

Eswar

[Former Member]

Hi,

Yes..You can change SY-LSIND..

Example.

WRITE: / 'BASIC LIST'.

AT LINE-SELECTION.

WRITE: / 'AT LINE SELECTION'.

SY-LSIND = 1.

When user presses back button it will take you to the basic list..

Thanks,

Naren

[Former Member]

Hi Sunil,

ABAP system fields are always available in your progams or system programs. You should treat them as constants & not modify them directly as important information for the flow of the program may be lost.

SY-LSIND-This system field is set by the runtime environment. Its content can be changed in the ABAP program to influence the runtime environment.

For a complete detail on this refer the link provided by SAP below:

<a href="http://help.sap.com/saphelp_erp2004/helpdata/EN/7b/fb96c8882811d295a90000e8353423/frameset.htm">http://help.sap.com/saphelp_erp2004/helpdata/EN/7b/fb96c8882811d295a90000e8353423/frameset.htm</a>

Regards,

Chetan.

PS:Reward points if this helps.

[Former Member]

Hi,

Yes you can make changes to the system fields , you can do that in debugging also.

With respect to sy-lsind , when you make chages to this you bsaically move to the level you have specified in the new value of sy-lsind.

Only thing you need to remeber in case of sy-lsind is that it works when you reduce the value of it , but not when you try to modify the value with a higher value.

Execute this code , put a breakpoint at the event AT LINE-SELECTION , change the value of sy-lsind and see the result.

data : v_string(100),
       v_count type num02 .
start-of-selection.
v_string  = 'test'.
clear v_count.

write v_string.
hide v_string.



at line-selection.
v_count = v_count + 1.
concatenate v_string v_count into v_string.
write:/ v_string.

Regards

Arun

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[Former Member]

Hi,

In case sy-lsind, we cann't make forward navigation, and we can make backword navigations.