Capture a custom in my form of database trigger exception

Hello. I have a database trigger on my Base Table with a custom exception that will trigger an error ORA-20000 in my form. "" My problem is that an error window appears reading "FRM-40735: WHEN BUTTON PRESSED triggered trigger unhandled exception ORA-20000. I try to capture the ORA-20000 in the trigger ON ERROR below code, but it does not work. I could catch the FRM-40735, but I really want to catch the ORA-20000 specifically. Is it possible to do both? At the end of the day, I want to replace my own message personalized as shown below. Any help would be appreciated. Thank you.
DECLARE 
  Alert_Message  VARCHAR2(200) := NULL;
  MSG_Num        NUMBER        := ERROR_CODE; 
  MSG_Txt        VARCHAR2(80)  := ERROR_TEXT; 
  MSG_Typ        VARCHAR2(3)   := ERROR_TYPE; 
BEGIN 
  IF MSG_Num NOT IN( 0, 40100, 20000 ) THEN          --replace with bad errcodes
    Alert_Message := (MSG_Typ||'-'||to_char(MSG_Num)||':'||MSG_Txt);
    Call_Alert.The_Error(Alert_Message); 
  ELSIF MSG_Num IN( 0 ) THEN          --replace with custom error messages to override the default messages
    Alert_Message := ('Custom Message Here');
    Call_Alert.The_Error(Alert_Message);     
  ELSIF MSG_Num IN( 20000 ) THEN          --replace with custom error messages to override the default messages
    Alert_Message := ('ORA-20000 - Bundle_Update_PC trigger failure on the Bundle table');
    Call_Alert.The_Error(Alert_Message);     
  END IF; 
if error_code =  40735 Then
 if dbms_error_code = -20001 THEN
  Alert_Message ...
 end if;
....

Tags: Oracle Development

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