How to disable a particular record in a block???help

Hi
i am form in which there is a db block.the block shows 12 records at a time...also the block has 12 db items but only 8 are on the canvas..4 four of these eight items are display items
My requiremnt is that if the value in..say..item_5 is 17 at any number of record then the particlar record becomes disabled. is it possible to achieve in forms 6i...
i would be extremly grateful if any one could work that out for me..as this is the requirement of my programme..
thanks in advance,
regrard,
Asim.

On the four items that the user can update, in your post-query trigger do this:
Set_item_instance_property('BLOCKNAME.ITEMNAME',
to_number(:System.trigger_record),
Update_allowed,Property_false);This will prevent the user from making any changes to the data, so Forms will not allow changes to the record. You will also need to prevent the user from deleting the record by adding code to the key-delrec trigger.

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