Item doesn't store value at proper page

Hi, Im using Apex 3.0.1 under XE
An item is not storing the value at point i need.... i'll explain
Got an item on page 1, it stores a value from a sql query. That item named P1 is calculated at a before header computation level on page1. P1 stores its value properly
At page 30 i got an item called P2_X that gets its value from a link column located into a report at page 1. P2X stores its value properly
On same page (30) i got another item called P2_Y. It's value comes form a query where P1 and P2_X are involved. P2_Y is calculated at a before header computation point.
Now, it seems P2_Y doesn't store any value. I wrote a &P2_Y. into a html region of page 30 to check out what value is stored, and there is nothing, it's null.
This is so weird, because i'm recreating an application i've already developed before. At that time i used the exact same logic for calculating those items.
now, is not working.
Do you think i'm missing some step, consideration, mmm... cache issue, calculating point or something?...
so strange...
thanks for your help
fernando

P2_Y needs to have a Source Used value of "Only, ..." if you want the computation-established value to persist on the page.
Scott

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Message was edited by:
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Hi !
Let me post my calculations here: I'm giving them here in logical order.
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