Supplier item attributes upload is not triggering a change order

Summary:

We have certain item attributes that are supposed to be updated by the supplier through a flat file and that should trigger a change order.

A product rule has been setup to identify which attributes should trigger a change order.

If an internal user modifies these attributes from their login and press the save button, system is opening the change order dialog window as expected.

But when a supplier uploads a file to modify the very same attributes, the changes are reflected in the item without initiating a change order.

Does anyone have an idea on the reason why is this happening?