Has anyone modified SCA to prevent shipping to PO boxes? I have integrated Avalara already to ensure valid addresses are entered, Avalara can identify if an address is a PO Box, however my integration occurs in the Address Module which then applies to both Billing and Shipping addresses, however I only want the PO Box check to apply to the shipping address. I am using the Order Wizard Module, and during the checkout steps customers can select any address from their address book to ship to. This occurs after an address is created/validated. I am having trouble finding how to apply validation at the point a customer selects a shipping address during the Order Wizard Module.