Fetch Sales Order Item: Delivery Date to Production Plan Item : Delivery Date

[dfranco]

Under Production Plan doctype, there is a child table called Production Plan Item.
I have created a Custom Field called “delivery_date” on the child table.

I would like to fetch the Delivery Date from Sales Order Item which is a child table of Sales Order doctype. when I save the Production Plan document.

Is this possible via client script?