Is it possible to default Source Organization in a Procurement Catalog?

Hi,

We're on EBS 12.1.3 with a lot of use of Internet Procurement for Expense Requisitions and Internal Sales Orders.

Since revamping our physical supply chain a while back, we now have a single Source Organization that our users need to select every time they choose an item from the catalog. This needs to be done every time and is causing a headache as it is not defaultable through Procurement Preferences.

Does anyone know if this is feasible using configuration/personalisation rather than customisation?

I've had a look at:

Procurement Preferences

Catalog Setup

Content Zones

Many thanks,

Pete