How to default the Purchasing Line type based on the Item selection in Purchase Requisitions

Summary:

Hello Oracle Experts! As per our client design, we have defined items in Product hub both for Inventory items and Expense Items also (Eg- Service charges, Professional fees and other good type Expense items as well) and so based on that we have defined two Line types- Goods and Work Order.

So as per the design if there are any job work scenario like civil works, the Purchase Requesters has to choose the Line Type as work order and raise a PR, but unfortunately they are choosing it incorrectly most of the times, and also the Buyer is not able to change the Line type in PO level as well and so the PO gets rejected in Approval.