Oracle Forms

I am getting a FRM-40501 error when attempting to update/change a check box value. There are a few factors in my form setup that could be the problem, I will list them below:

My initial problem was that my INSERT statement would not trigger to fire (based on an IF statement) when my check box value was not initially set to the value of 'Y', even though the initial value was set to 'Y' in the property palette (value when checked was set to 'Y' and value when unchecked was set to 'N'). So, to remedy this I placed a specific literal select of 'Y' and aliased it back to the name of my check box name in the data block query, like: SELECT 'Y' CB_SELECT_SCHOOL FROM user_schools. Then I changed the check box to a database item (value to Yes when it was No before my "SQL select cheat" in the data block query). This made the initial value 'Y' and satisfied my IF statement before my INSERT statement in my trigger. However, now I can not update the check box item.

Does anyone know a better way to satisfy the initial value of my check box to 'Y', even though in the initial value parameter for my checkbox is set to 'Y' and forms is not really setting the initial value (when the check box is not set to a database item)?

Thanks in advance.

Kyle