Fill column bound item with a select?

Hi,
I can't figure out how to do this, although I guess it's simple:
I have a column bound item (source=db column), the item is hidden, but I want to fill it with a default value when a record is inserted. The default value must come from a select.
I have tried it with a default value type plsql body and the "select something into :P11_Item_name from table" but that doesn't insert a value.
Any idea how to do this, except from creating a trigger on the table itself?
Thanks
Guido

Hi,
Well this is what I want to do:
I have an insert screen where a user can insert records.
Among other fields that the user needs to fill in, there is one field that needs to be filled with a value that comes from another table.
So this is the situation:
<user value>
<user value>
<select value from table>
And this altohether needs to be inserted as a new record into a table.
I think I can manage it by uncoupling the items from the database columns, and insert a record with a on submit computation.
But I have the idea that it can be done easier.
I guess it's often needed that a user inserts new records where one field comes from a select from another table?
In my example a user logs a request. This is inserted into a request table. But among the field the user enters for the request, a contact person has to be looked up (depending on the user's login) and stored into the request table as a column.
Maybe it's an idea to create a dummy item with it's source an sql query, and copy that item into the item with it's source <database column>??
I hope you get it, it's hard to explain.
Regards Guido

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