How to create alerts in oracle forms

First Step: 

you need to Create alert 

Second Step: 

Name of alert is “ERRMSG”

Alert Style = “Caution”

Button 1 Label = “OK”

Third Step:

Create Procedure

Procedure Name = “Call_alt”

Fourth Step:

Paste that code in the Procedure

PROCEDURE call_alt (msg in varchar2)IS

  alt number;

BEGIN

       Set_Alert_Property('errmsg', alert_message_text,msg );

       alt := show_alert('errmsg');

END;

Fifth Step:

Call this procedure from any trigger you show the message just pass the message.

In my case:

I created Button and use this trigger on “WHEN-BUTTON-PRESSED”

Output:

I hope it's helpful for you. If you have any queries, don't hesitate to contact me.

Name : Muhammad Sahal Qasim

E-mail : s.m.sahal789@gmail.com

Thank you.