Dynamic action in a report region in a master detail form

hi
I have created a master detail form , in which many validation etc is done ,the MASTER is a FORM and DETAIL is a REPORT
Now I am stuck up with the detail region .i.e report
I have Line Detail where there are ITEMS such as SL NO: ,ITEM_ID , UOM ( Unit of measuremnt ) etc
Now here is where I need help .
Using POP UP LOV i have managed to fetch in LOV for the item "ITEM_ID",--- i can select an item name using the pop up LOV ,
Now all that I want is when I select an item name from the pop up lov , an Item Id is displayed or fetched in that particular place , now i want the corresponding UOM to be diaplayed ( i.e the UOM for that particular Item Id which has been selected by me from the pop up lov ).
In order to resolve this I created a Dynamic action where in I get the UOM . Bt the problem is that the ITEMS displayed for selecting in the WHEN section (
DYNAMIC action
-IDENTIFICATION section
-WHEN section----- items ( here i am not listed with ITEMS of the REPORT region instead ITEMS of the MASTER is available )
-TRUE ACTION section etc is only the
ITEMS of the MASTER region ..
Please help me sort this out

Mod: moved from Japanese Apex

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Edited by: mtpaper on Oct 12, 2009 1:30 PM
Edited by: mtpaper on Oct 12, 2009 1:32 PM

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