If confirmation either via the supplier or an alert email that a price file has been created and linked to a site, but the site cannot order nor is the price file visible in the overview screen this will be because the price file has been de-activated by the supplier.
To active / deactivate Price Files, the supplier should follow the below steps on their portal:
Click into Price Lists and into Manage Price Lists.
Click the Edit button on the price file.
Tick / untick the Is Active option box.
Click Update to save the changes.