Problem replacing chart axis title with &string. syntax

Question

Apex 4.1.1
Hi,
I am having a problem replacing a chart axis title with substitution syntax &P5_MYFIELD., where P5_MYFIELD is an item with Source Type PL/SQL Function Body:
begin
return web_message.show('LASTNAME', 'dk');
end;
The Item is defined on the same Page as the chart in a different region. I can see that function is working ok, because the return value is displayed in P5_MYFIELD.
There is a second item in an other region on the same page where the source value is defined with substitution syntax &P5_MYFIELD. It also displays the expected value. But when I use the string &P5_MYFIELD. as axis title it is not displayed.
I also defined a field P0_MYFIELD on Page Zero with the same function, when I reference that with &P0_MYFIELD. as axis title on Page 5 the value is displayed correctly. I tried the same with a field on Page 1, &P1_MYFIELD. and it is displayed correctly.
I think, the chart axis title must be substituted before the item P5_MYFIELD is executing the PL/SQL function body to get its value. Can anyone tell me why?
We want to use string substitution syntax to translate all our labels in different languages. I would like to create hidden items with source type PL/SQL function body for all labels on a page and reference these values as label definitions. I would like to place them on the same page as the labels.
Thanks
Anne

Answer 1

I started the application again and now also the Items are not displayed, only the message 'Label not defined', so I probably did something wrong with the computation. Why the correct values were shown during the first run, I do not know, maybe i did not logout in between.
Here is the debugging information, but I cannot see any error message:
0.02844 0.00038 Computation point: Before Header 4
0.02881 0.00032 ...Perform computation of item: P5_CYCLE, type=FUNCTION_BODY 4
0.02913 0.00060 ...Performing function body computation 4
0.02973 0.00464 ...Execute Statement: declare function x return varchar2 is begin begin return web_message.show('CYCLE','de'); end; return null; end; begin wwv_flow.g_computation_result_vc := x; end; 4
0.03437 0.00042 ......Result = Wurf 4
0.03479 0.00046 ...Session State: Save "P5_CYCLE" - saving same value: "Wurf" 4
0.03526 0.00027 Processes - point: BEFORE_HEADER 4
0.03553 0.00027 ...close http header 4
0.03580
Edited by: Anne-Marie Rosa on Jun 8, 2012 10:09 AM
Now the correct value is displayed again in the P5_MYFIELD, because I had to set the item source back to PL/SQL Function body, but I am still getting the chart error and the chart is not displayed.
Edited by: Anne-Marie Rosa on Jun 8, 2012 10:17 AM