Reg Property Class

Question

Hi all,
i created 2 visual attributes NEGATIVE,NON_NEGATIVE and given different background colors, Then i created a property class with some properties of PURCHASE_COST field in the form names as US_CURRENCY. I created When-Validate-Item trigger under Property class with following pl-sql code:
IF :SYSTEM.CURSOR_VALUE < 100     THEN
     message('negative');
     message(' ');
     SET_ITEM_PROPERTY(:SYSTEM.CURSOR_ITEM, VISUAL_ATTRIBUTE,'NEGATIVE');
ELSE
     message('non-negative');
     message(' ');
     SET_ITEM_PROPERTY(:SYSTEM.CURSOR_ITEM, VISUAL_ATTRIBUTE,'NON_NEGATIVE');
END IF;
next i subclassed this property class to various currency fields in the form and then compiled and run, but the changes cannot be seen over the currency fields.
Regards,
Sreekanth.

Answer 1

Hi Francois,
i have nothing inside my property class but only have WHEN-VALIDATE-ITEM trigger which holds the code for selecting visual attribute at runtime:
BEGIN
IF TO_NUMBER(:SYSTEM.CURSOR_VALUE) < 0 THEN      -- Negative value entered
-- Attach NEGATIVE visual attribute to item     
SET_ITEM_INSTANCE_PROPERTY(:SYSTEM.CURSOR_ITEM, VISUAL_ATTRIBUTE, 'NEGATIVE');
ELSE                               -- Non-negative value entered
-- Attach NON_NEGATIVE visual attribute to item
SET_ITEM_INSTANCE_PROPERTY(:SYSTEM.CURSOR_ITEM, VISUAL_ATTRIBUTE, 'NON_NEGATIVE');
END IF;
EXCEPTION WHEN OTHERS THEN
     MESSAGE(TO_CHAR(SQLCODE)||'----'||SQLERRM);
END;
Now after i enter the PURCHASE_COST and move to another field, it is showing me the error:
*6502---ORA-6502:PL/SQL:numeric or value error*