When using before_save in SugarCRM 6.5 how do I stop the save?

Question

I am going to use before_save to review a Merge before it completes.

If both Contact records have the two different Student Ids, I want to stop the process and display a message saying it can't be done.

Amy Cox · Accepted Answer

A brute way of doing it is: die(" it can't be done. "); Or you can: SugarApplication::appendErrorMessage('

it can't be done.

' );