Add an update button

Question

Hello everyone!
I am using Oracle Forms 6i and here is my problemm..
I am trying to add a button in my forms that will update records in my table.
For example I have one datacolumn "TYPE_OF...", in my forms I made an ListItem for this column where I choose the type.
I made a recordGroup to automaticaly populate this item and everything works just fine.
Now when I press this button of mine (I named it "Change") I want to update my record and save it with the different type that I choose after saving the record first and the previuos record with the "old" type must be erased (not to have both records afterwards).
I started like this:
1. Made an alert (named "SPR") that will ask me when I press the button if I am sure that I want to change that record.
2. Alert have two buttons "Yes" and "No"
3. When I click on "Yes" my record is updated else nothing happens
Here is the CODE that I wrote in WHEN-BUTTON-PRESSED trigger (It doesn't work, normally, because I am quite new in PL/SQL programming):
DECLARE
     a NUMBER;
BEGIN
     a := SHOW_ALERT('SPR');
         IF a = Alert_Button1 THEN
          UPDATE My_Table (in my case name of the table is DOKUMENTI_GLAVA_UV - it's in Slovenian and it means Documents_Head)
          SET TYPE_OF.. (my case VRSTE_TEMELJNICE - means type of journal) = :D.TYPE_OF..; (my case - D is name of the block)
         ELSE
              RAISE FORM_TRIGGER_FAILURE;                  
  END IF;           
END;It gives me error and says that My_table must be declared.
All I want is the CODE for my trigger and some advice if I make something wrong or I am trying to do something that it can not be done that way.
Thank you!

Answer 1

First of all, Thank you!
I don't have anymore the problem with "DOKUMENTI_GLAVA_UV must be declared", I saw that I have to be signed in one another application that uses this form, so that is not an issue anymore.
Now I made one another block that is not database block, add in that block some display items that will copy my type of "VRSTE_TEMELJNICE" and beneath that item, I add ListItem on which I defined RecordGroup where I can choose my new type. I also add two buttons on this block where one is "Cancel" and the other is "OK" which means if I press on "OK" I want to change the type.
Just to answer on your question the D block is a database block but I have to do this because the item "VRSTE_TEMELJNICE" is unupdatable (update allowed is set to NO) and it has to be that way, so I can not just let forms to update the record.
So.. let's return on my issue. If I press on "OK" button my alert shows up and if I press "Yes" my record is updated.
The name of my displayItem is "IZVT", of listItem is "NAVT". I hope you can get the picture, if not, just tell me what is unclear and I'll try to explain.
So, I still need the CODE for my trigger on the "OK" button.