DA, Page Items to Submit and Page Items to Return

If you have a pl/sql type DA, the "Page Items to Submit" and "Page Items to Return" will be important, you must put the right Item into different bucket otherwise your DA may not work.

Basically, Items in "Page Items to Submit" will be those Items that you want to use the values inherit from your database inside your plsql block; while Items in  "Page Items to Return" will be those that you have changed their value and want to submit back to the databases by the page process.