Magento can't have an advanced price for a customer group on All Websites and on a specific website at the same time. Decide what Junipeer should do when that happens.
Yes – the price set for All Websites is removed, so the new website price can be saved.
No – the price isn't removed. Magento rejects the new price and an error is shown.
Good to know
This is shown when Magento Catalog Price Scope is set to Website and Replace advanced/tier prices is set to No.
This is an advanced setting.