Selection from T-list giving error 'Fied is protected against update'

Question

hii all,,
i have manged to make charater based search, for this
i am accepting characters 'as user types-in' in a text item 'vchar' .
As the user types in characters,the t-list item (vlist) gets populated with the matching characters
typed by the user .
i am testing it on on a non-db block (jmaster) fields..
Once i make any selection from the tlist,i want the field 'vchar' to hold the value/label selected from the
t-list (vlist).
the problem is when i click enter and make selection from the t-list
populated elements, and navigate to next field 'tcode'
'vchar' remains blank and the error... 'Fied is protected against update' gets displayed on the status bar.
here are my triggers ;
PRE-FORM  at form-level
SET_ITEM_PROPERTY('VLIST',DISPLAYED,PROPERTY_FALSE);
WHEN-TIMER-EXPIRED at form-level
If GET_APPLICATION_PROPERTY(TIMER_NAME) = 'COUNT_TIMER' Then
SET_ITEM_PROPERTY('VLIST',DISPLAYED,PROPERTY_TRUE);
:GLOBAL.M_SRCH := :VCHAR;
declare
v_char varchar2(200) := 'select VLIST,VLIST
                         from JRNY_MASTER
                         WHERE VLIST like '||'''%'||:GLOBAL.M_SRCH||'%''';
v_rg_id recordgroup;
v_err NUMBER:= 0;
BEGIN
v_rg_id := create_group_from_query('recgrp1',v_char);
v_err:= populate_group(v_rg_id);
clear_list('JMASTER.VLIST');
populate_list('JMASTER.VLIST',v_rg_id);
DELETE_GROUP(v_rg_id);
END;
Synchronize;
End if ;
WHEN-NEW-ITEM-INSTANCE for field 'vchar'
DECLARE
  timer_id Timer;
BEGIN
  :GLOBAL.M_SRCH := :VCHAR;
  SET_ITEM_PROPERTY('VLIST',DISPLAYED,PROPERTY_TRUE);
  SET_ITEM_PROPERTY('VLIST',ENABLED,PROPERTY_TRUE);
  SET_ITEM_PROPERTY('VLIST',UPDATE_ALLOWED,PROPERTY_TRUE);
  timer_id := CREATE_TIMER('COUNT_TIMER', 500, REPEAT);
END;
POST-TEXT-ITEM for field 'vchar'
:vchar := :JMASTER.VLIST;
Delete_Timer('COUNT_TIMER');
SET_ITEM_PROPERTY('VLIST',DISPLAYED,PROPERTY_FALSE);
WHEN-VALIDATE-ITEM for tlist item 'vlist'
:vchar := :VLIST;Please if some1 have understood my problem, so kindly reply me
what went wrong in my logic...
TY

Answer 1

Andreas Weiden wrote:
For the VLISt-item, you should set also INSERT_ALLOWED to true, as it is a new record.
also for the VLIST-item, you should Mouse-Navigable to false.yes it worked this time...Thanks Andreas...
but one thing..i also would like to add a new value in 'vchar',
in case, if i don't find a value typed in 'vchar' in 'vlist'.
when i try to enter new value in 'vchar' and navigate to the next item,
so based on my above codes..especially the 1 in POST-TEXT-ITEM
where i am assigning ;
:vchar := :JMASTER.VLIST;
'vchar' becomes NULL, as soon as i leave the 'vchar' and branch to the next item.
please suggest..whats should be changed...
TY once again...
Edited by: user10967485 on 25-Oct-2010 07:13
Edited by: user10967485 on 25-Oct-2010 11:29