Raise Form_Trigger_Failure Not Working

On my form I have a button. This button updates 3 base table items from it's when-button-pressed trigger.
My problem is that when another user comes along and clicks the button for the same record before a previous user has committed their changes the following messages are displayed 3 times (once for each item that the button attempts to update fields?):
1. Could not reserve record (2 tries). Keep trying?
2. FRM-40501: ORACLE error: unable to reserve record for update or delete
My desired result would be that these messages only appear once regardless of how many items the button attempts to update and that the form processing would be stopped after the first messages are displayed. This isn't happening.
To try to accomplish this I am using an On-Error trigger to capture the FRM-40501 error message and instead display my own custom message followed by "Raise Form_Trigger_Failure".
Despite the On-Error trigger displaying my custom message successfully, the "Raise Form_Trigger_Failure" doesn't seem to stop the form from processing the remaining code in the when-button-pressed trigger. These messages still appear multiple times in a row and the remainder of the when-button-pressed trigger code continues to run.
So my question is why isn't my "Raise Form_Trigger_Failure" working to suppress subsequent messages? Is there a way I can address this?
Any help would be greatly appreciated. Thanks.
Edited by: sharpe on Jul 13, 2012 9:39 AM

The FORM_TRIGGER_FAILURE in the ON-ERROR-trigger will not stop the code in your WHEN-BUTTON-PRESSED-trigger. Could you post the code from your trigger?

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Line: -----
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