Query to set item default value

Question

I'm trying to set a default value of an item by using a query. The first thing I tried is setting the source value to be:
select 'TRDM-R-'||LPAD((MAX(SUBSTR(EXPAND_REQ_ID,8,3))+1),3,'0') EXPAND_REQ_ID FROM BANKSRG.TRDM_REQUIREMENTS;
with item display type as Text, source type SQL Query. This displayed the value in the form, but did not save to the DB. (I tried all the other display types for text too)
The next thing I tried (a suggestion for someone else in the forum) was set item display type is Display as Text (based on PL/SQL, does not save state), and the source type is PL/SQL Anonymous Block, with this query:
for c1 in
(select LPAD((MAX(SUBSTR(EXPAND_REQ_ID,8,3))+1),3,'0') EXPAND_REQ_ID
FROM BANKSRG.TRDM_REQUIREMENTS)
LOOP
htp.p('TRDM-R-'||C1.EXPAND_REQ_ID);
EXIT;
END LOOP;
but I get this error: Error ERR-9132 Error in PLSQL expression for item default code, item=P2_EXPAND_REQ_ID
Then I tried the above query in the Default Value section, with the same error.
I've also tried adding computations, but if i get the value to display, it still won't save to the DB.
I would greatly appreciate any suggestions!
Robin

Answer 1

In case anyone else is new to HTMLDB and needs the answer to this question, I finally figured it out.
In the Item the Display is Text Field, Source Used is Always..., Source Type Database Column, Source Value EXPAND_REQ_ID, Default Value &P2_EXPAND_REQ_ID., Default Value Type is Static Text...
Then I created a Before Region computation, type sql Query, entered my query in the computation,
select Condition Type Value of Item in Expression 1 is NULL, Expression 1 is P2_EXPAND_REQ_ID.
Not so difficult, it just took a lot of time to try all the options.