custpm.pll - How to capture KEY-DELREC in Sales Orders form.

We need to execute a procedure when user delete a Sales Order Line to update the Quantity in our Quota Management process table.

Is it possible to capture this events KEY-DELREC or PRE-DELETE or POST-DELETE or ON-DELETE events on LINE block, when I saw the trigger property in the Form it is Override.

Please let me know.

I have gone through the following Documentation.

https://docs.oracle.com/cd/E18727_01/doc.121/e12897/T302934T458265.htm

Events Passed to the CUSTOM Library

KEY-Fn (where n is a number between 1 and 8)