URGENT,FRM-41337: Cannot populat the list from record group

Question

Hi all:
Can anyone help me in that problem?
I have a database item in the block as a list item with combo box style and I use this code in WHEN-NEW-RECORD-INSTANCE at the form module level to populate that combo box list:
DECLARE
     group_id RECORDGROUP := FIND_GROUP('group');
     list_id ITEM := FIND_ITEM('employees.job_id');
     x number;
BEGIN
IF NOT ID_NULL (group_id) THEN
          DELETE_GROUP (group_id);
     END IF;
          group_id := CREATE_GROUP_FROM_QUERY ('group','select name,TO_CHAR(id) job from cmn_jobs where job_type_id = 4720 ');
     x := POPULATE_GROUP (group_id);
     POPULATE_LIST (list_id, group_id);
     EXCEPTION
WHEN NO_DATA_FOUND THEN
null;
     END;
That code worked very well and without any problem, but when I change the list item from combo box style to poplist style then the forms give that error:
FRM-41337: Cannot populat the list from record group
And an additional null/blanke element appears in the poplist with original element that come from RECORDGROUP.
So can anyone help me to solve that problem please?

Answer 1

First, how I can assign a default or initial value DYNAMICALLY to my poplist.Set the default-value to a parameter like :PARAMETER.MYPARAMETER then you can assign the desired default-value to the parameter.
second, if I have popliste say X for example depend on another poplist say Y ,so when I put the code to populate popliste X on WHEN-LIST-CHANGED on popliste Y and make query then the >forms return FRM-40301 Query caused no records to be retrieved ,but when I have a copy for that code in WHEN-LIST-CHANGED and put it in WHEN-NEW-FORM-INSTANCE at the form >module the form work and returns records, so is it any error or exception in what I did.Can't answer that, you should check :SYSTEM.LAST_QUERY to see why the query does not returnany records.
At the last, which better to put the code for popliste in PRE-FORM trigger at the form module or in WHEN-NEW-FORM-INSTANCE at the form module.I would use the PRE-FORM-trigger