Approved supplier list functionality, does it work with non-inventory ordering

I found information in the Quarterly release documentation on how to set up Approve Supplier Lists. I can't find any definitive information on what ASL controls.

Is ASL only for inventory replenishment (SCO min/max) and automated Par ordering where more than one Supplier exists?

At present, we've added/managed ASL only for PIM based items where more than one BPA exists, usually with different suppliers and the same UOM.

Does ASL have any impact on RSSP based ordering or does only BPA priority and existing default hierarchy the only 'sequencing' of Supplier/UOM for manual requisitioning?