Connect each Magento website with a price list from your ERP. This is used to import base prices.
Each row connects:
a Magento Website, and
a price list from your ERP.
Good to know
You can use the same price list for several stores.
Tip: set a price list for the Default store as a fallback.
No base prices are imported if no mapping is defined.
This is shown when Magento Catalog Price Scope is set to Website.
If the list is empty, check that Magento is connected. An empty list almost always means the connection, not the setting.