Is possible to filter data in a LOV after it has been chosen?

Let's say I got a tabular with 5 records, and a LIST OF VALUES in that item (LOV).
ok, if in first record I choose the value in the list
and I go to second record, I dont want it to be again (I dont want the value I already chose).
I've tried several ways and dont find a way to do so, is it possible?
:o

These solutions work...until we goes to a third record. Now we need two values excluded (to be consistent). So this can really only be done through array processing, which is a bit sticky. It also implies that we can only create five records in this block.
So it might be simpler to offer the user a pre-created set of records, templates if you like, for the various values. This set could be determined by a picklist with checkboxes for the type of records; pre-existing records would have their checkbox disabled in the list.
However, I am generally against presenting the user with a different interface to do a generic task so I also offer an alternative alternative: don't mess with the LOV at all, but check for duplicate values in a WHEN-VALIDATE-ITEM trigger.
Cheers, APC

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