How to save defaulted 'Expenditure Organization' value based on the project and task selected in OAF

Hi All,

As per customer requirement, when we choose a task from LOV of a particular project on I procurement page attached herein, 'Expenditure Organization' fields should be defaulted with the task expenditure org. And this value defaulted can be edited if any changes needed.

Then once user will click on Save button the updated defaulted Expenditure Org value should be saved/committed to db table.

Please help me to achieve this functionality in iProc OAF Page R12.