The PopulateWarehousePhoneNumber order rule action means that if an order doesn't contain a phone number or you don't want to use a customer's phone number on the order details you can use the phone number within the Warehouse Address Details from where the order is being fulfilled.
Order Rule Action: PopulateWarehousePhoneNumber.
Param: Leave this field blank.
The PopulateWarehouseEmail order rule action means that if an order doesn't contain an email address or you don't want to use a customer's email address on the order details you can use the email address within the Warehouse Address Details from where the order is being fulfilled.
Order Rule Action: PopulateWarehouseEmail.
Param: Leave this field blank.
Where are the Warehouse address details?
To see warehouse address details please follow the steps below:
Click Warehouse then Manage Warehouses.
Click Edit against the specific Warehouse.
These contact details will be used for the order rule actions listed above.