How do I perform an action just before someone saves a data block?

Hi,
I need a trigger to attach to a datablock to perform some processing before the record is saved. I can't find anything suitable - I can see WHEN-VALIDATE-RECORD but this can run without you saving can't it? The code must only be executed when the user saves.
Can anyone help?
(Forms 6i)
Thanks Adam

Whatever you do, DO NOT use a KEY-COMMIT trigger !
There are many ways a commit can be performed without firing that trigger.
There is also POST-FORMS-COMMIT, which despite its name, fires before commit, ie if form_trigger failure is raised in it, then the commit does not happen.

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but it's wrong, as it populates oitm object from db, and not from the form. i have old values stored in the object, values tha are to be overwritten with those present on form.
i tried inspecting the form for data sources but i don't know how to navigate to the right one, i found only system generated objects with SYS_##, with no clue about the related dbfield
i tried getting the values directly from the form, but in object BusinessObjectInfo i don't have anything that identifies univocally the form i'm editing.
i mean if i have 2 item forms open, i don't know which one is the one i'm saving.
i'm expecting to find somewhere a temporary oitm business object containing values that are to be saved, values that i can easily check.
so i'm asking you how to find those values in order to perform my bl checks
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The values that are about to be saved should be in the datasources:
form.DataSources.DBDataSources.Item("OITM");
form.DataSources.DBDataSources.Item("ITM1");
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How do I perform an action just before someone saves a data block?

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