How to undo update of checkbox after triggering when-new-record-instance

Question

Hi,
I am using eBusiness Forms Personalization in 11.5.10 to alter the Receipts form in Purchasing. I want to prevent users checking the rcv_transaction checkbox if the destination is "Multiple" and, instead, click the "+" sign to explode the multiple record into it's many component records.
I can do this by invoking the when-new-record-instance trigger to make the "multiple" record fields unalterable and issue a warning message when the user selects such records. However, my problem is that - if the user clicks the checkbox as the first field in a "multiple" record, then this updates the checkbox to "Yes" BEFORE the trigger fires, which then locks the record for update.
What I need is a solution that either sets the checkbox to unalterable for "multiple" records BEFORE the user clicks into such records, OR a method of undoing the update of the checkbox after the record has been selected (I cannot do this by simply setting it to "No" by the trigger as this is still technically an update and locks the record).
Cheers
Graham

Answer 1

Hi Navnit,
Yes you are right, but it can work even we not plase quotation mark in it. But Yes I forget to place semi colon so now it is
IF :System.Cursor_Record = 1 THEN
   :Block.Col1 := '02:00';
ElsIF :System.Cursor_Record = 2 THEN
   :Block.Col1 := '07:00';
   ------and so on
END IF;Danish