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how to convert this idea into a list trigger ? urgent needed!!

wasabi3689 asked
Last Modified: 2013-12-19
I create a block named "media_request_info". There is one item/field called "status" which is a list with 3 elements - requested, in_progress and canceled.

I create a when-list-changed trigger for the status list.
Under this trigger, I want the following ideas to be converted into code
1. when status is in_progress, canceled, user cannot change the list values to something else. If they change, there will be a message popped up to warn them.
2. when status is "requested", if user wants to change it to "canceled", this is allowed. There will be a message to tell them if it's sure to make this change. If click "Yes", it will go to call a procedure to update the table. Attached is my code, but I still cannot convert above ideas to the code completely. The code still doesn't work well and still can allow users to change status from in_progress to something else.

I am using orcle 8i and form version is 11.0.35
IF (:media_request_info.status = 'IN_PROGRESS') THEN
       MESSAGE('The media request is in progress status and you cannot change the status.');
        set_item_property ('status', ENABLED, PROPERTY_FALSE);
  ELSIF (:media_request_info.status = 'CANCELED') THEN
       MESSAGE('The request has been canceled and you cannot change the status.');
       set_item_property ('status', ENABLED, PROPERTY_FALSE);
  ELSIF (:media_request_info.status = 'REQUESTED') THEN
---I don't know how to do if user want to change to canceled, this is allowed.  but not --in_progress
       MESSAGE('The media has been requested and you can only change to canceled.');

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